diff --git a/jsapp/js/account/organization/membersQuery.ts b/jsapp/js/account/organization/membersQuery.ts
index 1bec128e80..1f429767b6 100644
--- a/jsapp/js/account/organization/membersQuery.ts
+++ b/jsapp/js/account/organization/membersQuery.ts
@@ -1,9 +1,22 @@
-import {keepPreviousData, useQuery} from '@tanstack/react-query';
+// Libraries
+import {
+  useQuery,
+  useQueryClient,
+  useMutation,
+  keepPreviousData,
+} from '@tanstack/react-query';
+
+// Stores, hooks and utilities
+import {fetchGet, fetchPatch, fetchDelete} from 'js/api';
+import {
+  useOrganizationQuery,
+  type OrganizationUserRole
+} from './organizationQuery';
+
+// Constants and types
 import {endpoints} from 'js/api.endpoints';
 import type {PaginatedResponse} from 'js/dataInterface';
-import {fetchGet} from 'js/api';
 import {QueryKeys} from 'js/query/queryKeys';
-import {useOrganizationQuery, type OrganizationUserRole} from './organizationQuery';
 
 export interface OrganizationMember {
   /**
@@ -34,6 +47,62 @@ export interface OrganizationMember {
   };
 }
 
+function getMemberEndpoint(orgId: string, username: string) {
+  return endpoints.ORGANIZATION_MEMBER_URL
+    .replace(':organization_id', orgId)
+    .replace(':username', username);
+}
+
+/**
+ * Mutation hook for updating organization member. It ensures that all related
+ * queries refetch data (are invalidated).
+ */
+export function usePatchOrganizationMember(username: string) {
+  const queryClient = useQueryClient();
+
+  const orgQuery = useOrganizationQuery();
+  const orgId = orgQuery.data?.id;
+
+  return useMutation({
+    mutationFn: async (data: Partial<OrganizationMember>) => (
+      // We're asserting the `orgId` is not `undefined` here, because the parent
+      // query (`useOrganizationMembersQuery`) wouldn't be enabled without it.
+      // Plus all the organization-related UI (that would use this hook) is
+      // accessible only to logged in users.
+      fetchPatch<OrganizationMember>(getMemberEndpoint(orgId!, username), data)
+    ),
+    onSettled: () => {
+      // We invalidate query, so it will refetch (instead of refetching it
+      // directly, see: https://github.com/TanStack/query/discussions/2468)
+      queryClient.invalidateQueries({queryKey: [QueryKeys.organizationMembers]});
+    },
+  });
+}
+
+/**
+ * Mutation hook for removing member from organiztion. It ensures that all
+ * related queries refetch data (are invalidated).
+ */
+export function useRemoveOrganizationMember() {
+  const queryClient = useQueryClient();
+
+  const orgQuery = useOrganizationQuery();
+  const orgId = orgQuery.data?.id;
+
+  return useMutation({
+    mutationFn: async (username: string) => (
+      // We're asserting the `orgId` is not `undefined` here, because the parent
+      // query (`useOrganizationMembersQuery`) wouldn't be enabled without it.
+      // Plus all the organization-related UI (that would use this hook) is
+      // accessible only to logged in users.
+      fetchDelete(getMemberEndpoint(orgId!, username))
+    ),
+    onSettled: () => {
+      queryClient.invalidateQueries({queryKey: [QueryKeys.organizationMembers]});
+    },
+  });
+}
+
 /**
  * Fetches paginated list of members for given organization.
  * This is mainly needed for `useOrganizationMembersQuery`, so you most probably
@@ -49,7 +118,8 @@ async function getOrganizationMembers(
     offset: offset.toString(),
   });
 
-  const apiUrl = endpoints.ORGANIZATION_MEMBERS_URL.replace(':organization_id', orgId);
+  const apiUrl = endpoints.ORGANIZATION_MEMBERS_URL
+    .replace(':organization_id', orgId);
 
   return fetchGet<PaginatedResponse<OrganizationMember>>(
     apiUrl + '?' + params,
diff --git a/jsapp/js/account/organization/organizationQuery.ts b/jsapp/js/account/organization/organizationQuery.ts
index 604a2116a5..6eda653dea 100644
--- a/jsapp/js/account/organization/organizationQuery.ts
+++ b/jsapp/js/account/organization/organizationQuery.ts
@@ -37,6 +37,10 @@ export interface Organization {
   request_user_role: OrganizationUserRole;
 }
 
+/**
+ * Note that it's only possible to update the role via API to either `admin` or
+ * `member`.
+ */
 export enum OrganizationUserRole {
   member = 'member',
   admin = 'admin',
diff --git a/jsapp/js/api.endpoints.ts b/jsapp/js/api.endpoints.ts
index a6096989f1..d07960d7f5 100644
--- a/jsapp/js/api.endpoints.ts
+++ b/jsapp/js/api.endpoints.ts
@@ -6,6 +6,7 @@ export const endpoints = {
   SUBSCRIPTION_URL: '/api/v2/stripe/subscriptions/',
   ADD_ONS_URL: '/api/v2/stripe/addons/',
   ORGANIZATION_MEMBERS_URL: '/api/v2/organizations/:organization_id/members/',
+  ORGANIZATION_MEMBER_URL: '/api/v2/organizations/:organization_id/members/:username/',
   /** Expected parameters: price_id and organization_id **/
   CHECKOUT_URL: '/api/v2/stripe/checkout-link',
   /** Expected parameter: organization_id  **/