diff --git a/packages/common/container-definitions/api-report/container-definitions.api.md b/packages/common/container-definitions/api-report/container-definitions.api.md
index c944d5611f6e..b95c56b4c83a 100644
--- a/packages/common/container-definitions/api-report/container-definitions.api.md
+++ b/packages/common/container-definitions/api-report/container-definitions.api.md
@@ -204,7 +204,7 @@ export interface IContainerContext {
     // @deprecated (undocumented)
     readonly submitFn: (type: MessageType, contents: any, batch: boolean, appData?: any) => number;
     // (undocumented)
-    readonly submitSignalFn: (contents: any) => void;
+    readonly submitSignalFn: (contents: any, targetClientId?: string) => void;
     // (undocumented)
     readonly submitSummaryFn: (summaryOp: ISummaryContent, referenceSequenceNumber?: number) => number;
     // (undocumented)
@@ -260,7 +260,7 @@ export interface IDeltaManager<T, U> extends IEventProvider<IDeltaManagerEvents>
     // (undocumented)
     readonly readOnlyInfo: ReadOnlyInfo;
     readonly serviceConfiguration: IClientConfiguration | undefined;
-    submitSignal(content: any): void;
+    submitSignal(content: any, targetClientId?: string): void;
     readonly version: string;
 }
 
diff --git a/packages/common/container-definitions/src/deltas.ts b/packages/common/container-definitions/src/deltas.ts
index 845078dab3df..0624c352f7ff 100644
--- a/packages/common/container-definitions/src/deltas.ts
+++ b/packages/common/container-definitions/src/deltas.ts
@@ -216,7 +216,7 @@ export interface IDeltaManager<T, U> extends IEventProvider<IDeltaManagerEvents>
 	 */
 	// TODO: use `unknown` instead (API breaking)
 	// eslint-disable-next-line @typescript-eslint/no-explicit-any
-	submitSignal(content: any): void;
+	submitSignal(content: any, targetClientId?: string): void;
 }
 
 /**
diff --git a/packages/common/container-definitions/src/runtime.ts b/packages/common/container-definitions/src/runtime.ts
index 2c9e78bcaeb2..8b460f0fa2b2 100644
--- a/packages/common/container-definitions/src/runtime.ts
+++ b/packages/common/container-definitions/src/runtime.ts
@@ -165,7 +165,7 @@ export interface IContainerContext {
 	) => number;
 	// TODO: use `unknown` instead (API breaking)
 	// eslint-disable-next-line @typescript-eslint/no-explicit-any
-	readonly submitSignalFn: (contents: any) => void;
+	readonly submitSignalFn: (contents: any, targetClientId?: string) => void;
 	readonly disposeFn?: (error?: ICriticalContainerError) => void;
 	readonly closeFn: (error?: ICriticalContainerError) => void;
 	readonly deltaManager: IDeltaManager<ISequencedDocumentMessage, IDocumentMessage>;
diff --git a/packages/common/driver-definitions/api-report/driver-definitions.api.md b/packages/common/driver-definitions/api-report/driver-definitions.api.md
index c08136b414c1..0b45c49399d8 100644
--- a/packages/common/driver-definitions/api-report/driver-definitions.api.md
+++ b/packages/common/driver-definitions/api-report/driver-definitions.api.md
@@ -147,7 +147,7 @@ export interface IDocumentDeltaConnection extends IDisposable, IEventProvider<ID
     relayServiceAgent?: string;
     serviceConfiguration: IClientConfiguration;
     submit(messages: IDocumentMessage[]): void;
-    submitSignal(message: any): void;
+    submitSignal(content: any, targetClientId?: string): void;
     version: string;
 }
 
diff --git a/packages/common/driver-definitions/src/storage.ts b/packages/common/driver-definitions/src/storage.ts
index 484405f7b3b4..4ec8d39d17b4 100644
--- a/packages/common/driver-definitions/src/storage.ts
+++ b/packages/common/driver-definitions/src/storage.ts
@@ -273,11 +273,11 @@ export interface IDocumentDeltaConnection
 	submit(messages: IDocumentMessage[]): void;
 
 	/**
-	 * Submit a new signal to the server
+	 * Submits a new signal to the server
 	 */
 	// TODO: Use something other than `any`.
 	// eslint-disable-next-line @typescript-eslint/no-explicit-any
-	submitSignal(message: any): void;
+	submitSignal(content: any, targetClientId?: string): void;
 }
 
 export enum LoaderCachingPolicy {
diff --git a/packages/drivers/driver-base/api-report/driver-base.api.md b/packages/drivers/driver-base/api-report/driver-base.api.md
index f2b9843d9e66..ec3a6d660c47 100644
--- a/packages/drivers/driver-base/api-report/driver-base.api.md
+++ b/packages/drivers/driver-base/api-report/driver-base.api.md
@@ -82,7 +82,7 @@ export class DocumentDeltaConnection extends EventEmitterWithErrorHandling<IDocu
     // (undocumented)
     protected readonly socket: Socket;
     submit(messages: IDocumentMessage[]): void;
-    submitSignal(message: IDocumentMessage): void;
+    submitSignal(content: IDocumentMessage, targetClientId?: string): void;
     get version(): string;
 }
 
diff --git a/packages/drivers/driver-base/src/documentDeltaConnection.ts b/packages/drivers/driver-base/src/documentDeltaConnection.ts
index ef21313feb50..0a54ffcd3a20 100644
--- a/packages/drivers/driver-base/src/documentDeltaConnection.ts
+++ b/packages/drivers/driver-base/src/documentDeltaConnection.ts
@@ -9,7 +9,7 @@ import {
 	IDocumentDeltaConnection,
 	IDocumentDeltaConnectionEvents,
 } from "@fluidframework/driver-definitions";
-import { createGenericNetworkError } from "@fluidframework/driver-utils";
+import { UsageError, createGenericNetworkError } from "@fluidframework/driver-utils";
 import {
 	ConnectionMode,
 	IClientConfiguration,
@@ -331,11 +331,17 @@ export class DocumentDeltaConnection
 	/**
 	 * Submits a new signal to the server
 	 *
-	 * @param message - signal to submit
+	 * @param content - Content of the signal.
+	 * @param targetClientId - When specified, the signal is only sent to the provided client id.
 	 */
-	public submitSignal(message: IDocumentMessage): void {
+	public submitSignal(content: IDocumentMessage, targetClientId?: string): void {
 		this.checkNotDisposed();
-		this.emitMessages("submitSignal", [[message]]);
+
+		if (targetClientId && this.details.supportedFeatures?.submit_signals_v2 !== true) {
+			throw new UsageError("Sending signals to specific client ids is not supported.");
+		}
+
+		this.emitMessages("submitSignal", [[content]]);
 	}
 
 	/**
diff --git a/packages/drivers/odsp-driver/src/odspDocumentDeltaConnection.ts b/packages/drivers/odsp-driver/src/odspDocumentDeltaConnection.ts
index fcae07c54e8b..8b597a1bb300 100644
--- a/packages/drivers/odsp-driver/src/odspDocumentDeltaConnection.ts
+++ b/packages/drivers/odsp-driver/src/odspDocumentDeltaConnection.ts
@@ -19,6 +19,7 @@ import {
 	IConnect,
 	IDocumentMessage,
 	INack,
+	ISentSignalMessage,
 	ISequencedDocumentMessage,
 	ISignalMessage,
 } from "@fluidframework/protocol-definitions";
@@ -34,6 +35,7 @@ import { pkgVersion } from "./packageVersion";
 const protocolVersions = ["^0.4.0", "^0.3.0", "^0.2.0", "^0.1.0"];
 const feature_get_ops = "api_get_ops";
 const feature_flush_ops = "api_flush_ops";
+const feature_submit_signals_v2 = "submit_signals_v2";
 
 export interface FlushResult {
 	lastPersistedSequenceNumber?: number;
@@ -296,8 +298,11 @@ export class OdspDocumentDeltaConnection extends DocumentDeltaConnection {
 			relayUserAgent: [client.details.environment, ` driverVersion:${pkgVersion}`].join(";"),
 		};
 
+		connectMessage.supportedFeatures = {
+			[feature_submit_signals_v2]: true,
+		};
+
 		// Reference to this client supporting get_ops flow.
-		connectMessage.supportedFeatures = {};
 		if (mc.config.getBoolean("Fluid.Driver.Odsp.GetOpsEnabled") !== false) {
 			connectMessage.supportedFeatures[feature_get_ops] = true;
 		}
@@ -736,10 +741,17 @@ export class OdspDocumentDeltaConnection extends DocumentDeltaConnection {
 	/**
 	 * Submits a new signal to the server
 	 *
-	 * @param message - signal to submit
+	 * @param content - Content of the signal.
+	 * @param targetClientId - When specified, the signal is only sent to the provided client id.
 	 */
-	public submitSignal(message: IDocumentMessage): void {
-		this.emitMessages("submitSignal", [[message]]);
+	public submitSignal(content: IDocumentMessage, targetClientId?: string): void {
+		const signal: ISentSignalMessage = {
+			content,
+			targetClientId,
+		};
+
+		// back-compat: the typing for this method and emitMessages is incorrect, will be fixed in a future PR
+		this.emitMessages("submitSignal", [signal] as any);
 	}
 
 	/**
diff --git a/packages/loader/container-loader/src/connectionManager.ts b/packages/loader/container-loader/src/connectionManager.ts
index 7d98cd2247c6..7583c8c6f6b3 100644
--- a/packages/loader/container-loader/src/connectionManager.ts
+++ b/packages/loader/container-loader/src/connectionManager.ts
@@ -1059,9 +1059,9 @@ export class ConnectionManager implements IConnectionManager {
 		};
 	}
 
-	public submitSignal(content: any) {
+	public submitSignal(content: any, targetClientId?: string) {
 		if (this.connection !== undefined) {
-			this.connection.submitSignal(content);
+			this.connection.submitSignal(content, targetClientId);
 		} else {
 			this.logger.sendErrorEvent({ eventName: "submitSignalDisconnected" });
 		}
diff --git a/packages/loader/container-loader/src/container.ts b/packages/loader/container-loader/src/container.ts
index a8d773c098cb..973b35df1cc2 100644
--- a/packages/loader/container-loader/src/container.ts
+++ b/packages/loader/container-loader/src/container.ts
@@ -2345,8 +2345,8 @@ export class Container
 		this.emit("op", message);
 	}
 
-	private submitSignal(message: any) {
-		this._deltaManager.submitSignal(JSON.stringify(message));
+	private submitSignal(content: any, targetClientId?: string) {
+		this._deltaManager.submitSignal(JSON.stringify(content), targetClientId);
 	}
 
 	private processSignal(message: ISignalMessage) {
@@ -2440,7 +2440,7 @@ export class Container
 				this.submitSummaryMessage(summaryOp, referenceSequenceNumber),
 			(batch: IBatchMessage[], referenceSequenceNumber?: number) =>
 				this.submitBatch(batch, referenceSequenceNumber),
-			(message) => this.submitSignal(message),
+			(content, targetClientId) => this.submitSignal(content, targetClientId),
 			(error?: ICriticalContainerError) => this.dispose(error),
 			(error?: ICriticalContainerError) => this.close(error),
 			this.updateDirtyContainerState,
diff --git a/packages/loader/container-loader/src/containerContext.ts b/packages/loader/container-loader/src/containerContext.ts
index 41a9fc0efa56..16927ad4145a 100644
--- a/packages/loader/container-loader/src/containerContext.ts
+++ b/packages/loader/container-loader/src/containerContext.ts
@@ -85,7 +85,7 @@ export class ContainerContext implements IContainerContext {
 			batch: IBatchMessage[],
 			referenceSequenceNumber?: number,
 		) => number,
-		public readonly submitSignalFn: (contents: any) => void,
+		public readonly submitSignalFn: (content: any, targetClientId?: string) => void,
 		public readonly disposeFn: (error?: ICriticalContainerError) => void,
 		public readonly closeFn: (error?: ICriticalContainerError) => void,
 		public readonly updateDirtyContainerState: (dirty: boolean) => void,
diff --git a/packages/loader/container-loader/src/contracts.ts b/packages/loader/container-loader/src/contracts.ts
index d4c531a81834..8be141784255 100644
--- a/packages/loader/container-loader/src/contracts.ts
+++ b/packages/loader/container-loader/src/contracts.ts
@@ -100,7 +100,7 @@ export interface IConnectionManager {
 	 * Submits signal to relay service.
 	 * Called only when active connection is present.
 	 */
-	submitSignal(content: any): void;
+	submitSignal(content: any, targetClientId?: string): void;
 
 	/**
 	 * Submits messages to relay service.
diff --git a/packages/loader/container-loader/src/deltaManager.ts b/packages/loader/container-loader/src/deltaManager.ts
index c66def1a1263..1c5904dab4db 100644
--- a/packages/loader/container-loader/src/deltaManager.ts
+++ b/packages/loader/container-loader/src/deltaManager.ts
@@ -301,8 +301,8 @@ export class DeltaManager<TConnectionManager extends IConnectionManager>
 		return message.clientSequenceNumber;
 	}
 
-	public submitSignal(content: any) {
-		return this.connectionManager.submitSignal(content);
+	public submitSignal(content: any, targetClientId?: string) {
+		return this.connectionManager.submitSignal(content, targetClientId);
 	}
 
 	public flush() {
diff --git a/packages/runtime/container-runtime/api-report/container-runtime.api.md b/packages/runtime/container-runtime/api-report/container-runtime.api.md
index d45941ca61c7..b85b98d8cfff 100644
--- a/packages/runtime/container-runtime/api-report/container-runtime.api.md
+++ b/packages/runtime/container-runtime/api-report/container-runtime.api.md
@@ -212,9 +212,8 @@ export class ContainerRuntime extends TypedEventEmitter<IContainerRuntimeEvents
     submitDataStoreAliasOp(contents: any, localOpMetadata: unknown): void;
     // (undocumented)
     submitDataStoreOp(id: string, contents: any, localOpMetadata?: unknown): void;
-    // (undocumented)
-    submitDataStoreSignal(address: string, type: string, content: any): void;
-    submitSignal(type: string, content: any): void;
+    submitDataStoreSignal(address: string, type: string, content: any, targetClientId?: string): void;
+    submitSignal(type: string, content: any, targetClientId?: string): void;
     submitSummary(options: ISubmitSummaryOptions): Promise<SubmitSummaryResult>;
     summarize(options: {
         fullTree?: boolean;
diff --git a/packages/runtime/container-runtime/src/containerRuntime.ts b/packages/runtime/container-runtime/src/containerRuntime.ts
index 121f5e7194ec..48db350dae7f 100644
--- a/packages/runtime/container-runtime/src/containerRuntime.ts
+++ b/packages/runtime/container-runtime/src/containerRuntime.ts
@@ -989,7 +989,7 @@ export class ContainerRuntime
 		summaryOp: ISummaryContent,
 		referenceSequenceNumber?: number,
 	) => number;
-	private readonly submitSignalFn: (contents: any) => void;
+	private readonly submitSignalFn: (content: any, targetClientId?: string) => void;
 	public readonly disposeFn: (error?: ICriticalContainerError) => void;
 	public readonly closeFn: (error?: ICriticalContainerError) => void;
 
@@ -2664,16 +2664,28 @@ export class ContainerRuntime
 	 * Submits the signal to be sent to other clients.
 	 * @param type - Type of the signal.
 	 * @param content - Content of the signal.
+	 * @param targetClientId - When specified, the signal is only sent to the provided client id.
 	 */
-	public submitSignal(type: string, content: any) {
+	public submitSignal(type: string, content: any, targetClientId?: string) {
 		this.verifyNotClosed();
 		const envelope = this.createNewSignalEnvelope(undefined /* address */, type, content);
-		return this.submitSignalFn(envelope);
+		return this.submitSignalFn(envelope, targetClientId);
 	}
 
-	public submitDataStoreSignal(address: string, type: string, content: any) {
+	/**
+	 * Submits the signal to be sent to other clients.
+	 * @param type - Type of the signal.
+	 * @param content - Content of the signal.
+	 * @param targetClientId - When specified, the signal is only sent to the provided client id.
+	 */
+	public submitDataStoreSignal(
+		address: string,
+		type: string,
+		content: any,
+		targetClientId?: string,
+	) {
 		const envelope = this.createNewSignalEnvelope(address, type, content);
-		return this.submitSignalFn(envelope);
+		return this.submitSignalFn(envelope, targetClientId);
 	}
 
 	public setAttachState(attachState: AttachState.Attaching | AttachState.Attached): void {
diff --git a/packages/runtime/container-runtime/src/dataStoreContext.ts b/packages/runtime/container-runtime/src/dataStoreContext.ts
index 92113724ebb1..f9988bbab20a 100644
--- a/packages/runtime/container-runtime/src/dataStoreContext.ts
+++ b/packages/runtime/container-runtime/src/dataStoreContext.ts
@@ -721,11 +721,17 @@ export abstract class FluidDataStoreContext
 		}
 	}
 
-	public submitSignal(type: string, content: any) {
+	/**
+	 * Submits the signal to be sent to other clients.
+	 * @param type - Type of the signal.
+	 * @param content - Content of the signal.
+	 * @param targetClientId - When specified, the signal is only sent to the provided client id.
+	 */
+	public submitSignal(type: string, content: any, targetClientId?: string) {
 		this.verifyNotClosed("submitSignal");
 
 		assert(!!this.channel, 0x147 /* "Channel must exist on submitting signal" */);
-		return this._containerRuntime.submitDataStoreSignal(this.id, type, content);
+		return this._containerRuntime.submitDataStoreSignal(this.id, type, content, targetClientId);
 	}
 
 	/**
diff --git a/packages/runtime/container-runtime/src/deltaManagerProxyBase.ts b/packages/runtime/container-runtime/src/deltaManagerProxyBase.ts
index ee8baedfafb2..4d98bef92a2a 100644
--- a/packages/runtime/container-runtime/src/deltaManagerProxyBase.ts
+++ b/packages/runtime/container-runtime/src/deltaManagerProxyBase.ts
@@ -101,8 +101,8 @@ export class DeltaManagerProxyBase
 		super.dispose();
 	}
 
-	public submitSignal(content: any): void {
-		return this.deltaManager.submitSignal(content);
+	public submitSignal(content: any, targetClientId?: string): void {
+		return this.deltaManager.submitSignal(content, targetClientId);
 	}
 
 	public flush(): void {
diff --git a/packages/runtime/datastore-definitions/api-report/datastore-definitions.api.md b/packages/runtime/datastore-definitions/api-report/datastore-definitions.api.md
index bbdf8567a75f..252a2b86d56c 100644
--- a/packages/runtime/datastore-definitions/api-report/datastore-definitions.api.md
+++ b/packages/runtime/datastore-definitions/api-report/datastore-definitions.api.md
@@ -127,7 +127,7 @@ export interface IFluidDataStoreRuntime extends IEventProvider<IFluidDataStoreRu
     request(request: IRequest): Promise<IResponse>;
     // (undocumented)
     readonly rootRoutingContext: IFluidHandleContext;
-    submitSignal(type: string, content: any): void;
+    submitSignal(type: string, content: any, targetClientId?: string): void;
     uploadBlob(blob: ArrayBufferLike, signal?: AbortSignal): Promise<IFluidHandle<ArrayBufferLike>>;
     waitAttached(): Promise<void>;
 }
diff --git a/packages/runtime/datastore-definitions/src/dataStoreRuntime.ts b/packages/runtime/datastore-definitions/src/dataStoreRuntime.ts
index 7f15356b6d9c..c4856ae2e63d 100644
--- a/packages/runtime/datastore-definitions/src/dataStoreRuntime.ts
+++ b/packages/runtime/datastore-definitions/src/dataStoreRuntime.ts
@@ -112,8 +112,9 @@ export interface IFluidDataStoreRuntime
 	 * Submits the signal to be sent to other clients.
 	 * @param type - Type of the signal.
 	 * @param content - Content of the signal.
+	 * @param targetClientId - When specified, the signal is only sent to the provided client id.
 	 */
-	submitSignal(type: string, content: any): void;
+	submitSignal(type: string, content: any, targetClientId?: string): void;
 
 	/**
 	 * Returns the current quorum.
diff --git a/packages/runtime/datastore/api-report/datastore.api.md b/packages/runtime/datastore/api-report/datastore.api.md
index fd6073a27d9c..0b1e27fa9f6d 100644
--- a/packages/runtime/datastore/api-report/datastore.api.md
+++ b/packages/runtime/datastore/api-report/datastore.api.md
@@ -118,8 +118,7 @@ export class FluidDataStoreRuntime extends TypedEventEmitter<IFluidDataStoreRunt
     setConnectionState(connected: boolean, clientId?: string): void;
     // (undocumented)
     submitMessage(type: DataStoreMessageType, content: any, localOpMetadata: unknown): void;
-    // (undocumented)
-    submitSignal(type: string, content: any): void;
+    submitSignal(type: string, content: any, targetClientId?: string): void;
     summarize(fullTree?: boolean, trackState?: boolean, telemetryContext?: ITelemetryContext): Promise<ISummaryTreeWithStats>;
     updateUsedRoutes(usedRoutes: string[]): void;
     // (undocumented)
diff --git a/packages/runtime/datastore/src/dataStoreRuntime.ts b/packages/runtime/datastore/src/dataStoreRuntime.ts
index cf9daf9ba030..d0d5a3eb6a17 100644
--- a/packages/runtime/datastore/src/dataStoreRuntime.ts
+++ b/packages/runtime/datastore/src/dataStoreRuntime.ts
@@ -860,9 +860,15 @@ export class FluidDataStoreRuntime
 		this.submit(type, content, localOpMetadata);
 	}
 
-	public submitSignal(type: string, content: any) {
+	/**
+	 * Submits the signal to be sent to other clients.
+	 * @param type - Type of the signal.
+	 * @param content - Content of the signal.
+	 * @param targetClientId - When specified, the signal is only sent to the provided client id.
+	 */
+	public submitSignal(type: string, content: any, targetClientId?: string) {
 		this.verifyNotClosed();
-		return this.dataStoreContext.submitSignal(type, content);
+		return this.dataStoreContext.submitSignal(type, content, targetClientId);
 	}
 
 	/**
diff --git a/packages/runtime/runtime-definitions/api-report/runtime-definitions.api.md b/packages/runtime/runtime-definitions/api-report/runtime-definitions.api.md
index 519b1471721c..b65a7433e3a0 100644
--- a/packages/runtime/runtime-definitions/api-report/runtime-definitions.api.md
+++ b/packages/runtime/runtime-definitions/api-report/runtime-definitions.api.md
@@ -266,7 +266,7 @@ export interface IFluidDataStoreContext extends IEventProvider<IFluidDataStoreCo
     // (undocumented)
     readonly storage: IDocumentStorageService;
     submitMessage(type: string, content: any, localOpMetadata: unknown): void;
-    submitSignal(type: string, content: any): void;
+    submitSignal(type: string, content: any, targetClientId?: string): void;
     // (undocumented)
     uploadBlob(blob: ArrayBufferLike, signal?: AbortSignal): Promise<IFluidHandle<ArrayBufferLike>>;
 }
diff --git a/packages/runtime/runtime-definitions/src/dataStoreContext.ts b/packages/runtime/runtime-definitions/src/dataStoreContext.ts
index 1353690f32d6..09a73b445e9f 100644
--- a/packages/runtime/runtime-definitions/src/dataStoreContext.ts
+++ b/packages/runtime/runtime-definitions/src/dataStoreContext.ts
@@ -464,8 +464,9 @@ export interface IFluidDataStoreContext
 	 * Submits the signal to be sent to other clients.
 	 * @param type - Type of the signal.
 	 * @param content - Content of the signal.
+	 * @param targetClientId - When specified, the signal is only sent to the provided client id.
 	 */
-	submitSignal(type: string, content: any): void;
+	submitSignal(type: string, content: any, targetClientId?: string): void;
 
 	/**
 	 * Called to make the data store locally visible in the container. This happens automatically for root data stores