diff --git a/src/Uno.UI.Wasm/WasmScripts/Uno.UI.d.ts b/src/Uno.UI.Wasm/WasmScripts/Uno.UI.d.ts
index 1ab574384cf8..cf04cfc8fc9c 100644
--- a/src/Uno.UI.Wasm/WasmScripts/Uno.UI.d.ts
+++ b/src/Uno.UI.Wasm/WasmScripts/Uno.UI.d.ts
@@ -522,6 +522,7 @@ declare namespace Uno.UI {
         private removeLoading;
         private resize;
         private onfocusin;
+        private onWindowBlur;
         private dispatchEvent;
         private getIsConnectedToRootElement;
         setCursor(cssCursor: string): string;
diff --git a/src/Uno.UI.Wasm/WasmScripts/Uno.UI.js b/src/Uno.UI.Wasm/WasmScripts/Uno.UI.js
index 6cd9218f151e..6840a5b91878 100644
--- a/src/Uno.UI.Wasm/WasmScripts/Uno.UI.js
+++ b/src/Uno.UI.Wasm/WasmScripts/Uno.UI.js
@@ -1548,6 +1548,7 @@ var Uno;
                         x.preventDefault();
                     }
                 });
+                window.addEventListener("blur", this.onWindowBlur);
             }
             removeLoading() {
                 if (!this.loadingElementId) {
@@ -1580,6 +1581,15 @@ var Uno;
                     WindowManager.focusInMethod(htmlId);
                 }
             }
+            onWindowBlur() {
+                if (WindowManager.isHosted) {
+                    console.warn("Focus not supported in hosted mode");
+                }
+                else {
+                    // Unset managed focus when Window loses focus
+                    WindowManager.focusInMethod(-1);
+                }
+            }
             dispatchEvent(element, eventName, eventPayload = null) {
                 const htmlId = Number(element.getAttribute("XamlHandle"));
                 // console.debug(`${element.getAttribute("id")}: Raising event ${eventName}.`);
diff --git a/src/Uno.UI.Wasm/ts/WindowManager.ts b/src/Uno.UI.Wasm/ts/WindowManager.ts
index ec9372ac32b7..f0a9d64b7d6e 100644
--- a/src/Uno.UI.Wasm/ts/WindowManager.ts
+++ b/src/Uno.UI.Wasm/ts/WindowManager.ts
@@ -1612,6 +1612,7 @@
 					x.preventDefault();
 				}
 			})
+			window.addEventListener("blur", this.onWindowBlur);
 		}
 
 		private removeLoading() {
@@ -1652,6 +1653,16 @@
 			}
 		}
 
+		private onWindowBlur() {
+			if (WindowManager.isHosted) {
+				console.warn("Focus not supported in hosted mode");
+			}
+			else {
+				// Unset managed focus when Window loses focus
+				WindowManager.focusInMethod(-1);
+			}
+		}
+
 		private dispatchEvent(element: HTMLElement | SVGElement, eventName: string, eventPayload: string = null): boolean {
 			const htmlId = Number(element.getAttribute("XamlHandle"));