diff --git a/.changeset/groups.removeModerator.md b/.changeset/groups.removeModerator.md
new file mode 100644
index 0000000000000..426009eebbc66
--- /dev/null
+++ b/.changeset/groups.removeModerator.md
@@ -0,0 +1,6 @@
+---
+"@rocket.chat/meteor": minor
+"@rocket.chat/rest-typings": minor
+---
+
+Add OpenAPI support for the Rocket.Chat groups.removeModerator API endpoints by migrating to a modern chained route definition syntax and utilizing shared AJV schemas for validation
\ No newline at end of file
diff --git a/apps/meteor/app/api/server/v1/groups.ts b/apps/meteor/app/api/server/v1/groups.ts
index 2437813860836..d9ce9e6939528 100644
--- a/apps/meteor/app/api/server/v1/groups.ts
+++ b/apps/meteor/app/api/server/v1/groups.ts
@@ -1,7 +1,16 @@
 import { Team, isMeteorError } from '@rocket.chat/core-services';
 import type { IIntegration, IUser, IRoom, RoomType, UserStatus } from '@rocket.chat/core-typings';
 import { Integrations, Messages, Rooms, Subscriptions, Uploads, Users } from '@rocket.chat/models';
-import { isGroupsOnlineProps, isGroupsMessagesProps, isGroupsFilesProps } from '@rocket.chat/rest-typings';
+import {
+	isGroupsOnlineProps,
+	isGroupsMessagesProps,
+	isGroupsFilesProps,
+	ajv,
+	validateBadRequestErrorResponse,
+	validateUnauthorizedErrorResponse,
+	withGroupBaseProperties,
+	GroupsBaseProps
+} from '@rocket.chat/rest-typings';
 import { isTruthy } from '@rocket.chat/tools';
 import { check, Match } from 'meteor/check';
 import { Meteor } from 'meteor/meteor';
@@ -31,6 +40,7 @@ import { executeGetRoomRoles } from '../../../lib/server/methods/getRoomRoles';
 import { leaveRoomMethod } from '../../../lib/server/methods/leaveRoom';
 import { executeUnarchiveRoom } from '../../../lib/server/methods/unarchiveRoom';
 import { normalizeMessagesForUser } from '../../../utils/server/lib/normalizeMessagesForUser';
+import type { ExtractRoutesFromAPI } from '../ApiClass';
 import { API } from '../api';
 import { addUserToFileObj } from '../helpers/addUserToFileObj';
 import { composeRoomWithLastMessage } from '../helpers/composeRoomWithLastMessage';
@@ -67,7 +77,7 @@ async function getRoomFromParams(params: { roomId?: string } | { roomName?: stri
 		}
 	})();
 
-	if (!room || room.t !== 'p') {
+	if (room?.t !== 'p') {
 		throw new Meteor.Error('error-room-not-found', 'The required "roomId" or "roomName" param provided does not match any group');
 	}
 
@@ -273,7 +283,7 @@ API.v1.addRoute(
 				room = await Rooms.findOneByName(params.roomName || '');
 			}
 
-			if (!room || room.t !== 'p') {
+			if (room?.t !== 'p') {
 				throw new Meteor.Error('error-room-not-found', 'The required "roomId" or "roomName" param provided does not match any group');
 			}
 
@@ -791,7 +801,7 @@ API.v1.addRoute(
 				rid: findResult.rid,
 				...parseIds(mentionIds, 'mentions._id'),
 				...parseIds(starredIds, 'starred._id'),
-				...(pinned && pinned.toLowerCase() === 'true' ? { pinned: true } : {}),
+				...(pinned?.toLowerCase() === 'true' ? { pinned: true } : {}),
 				_hidden: { $ne: true },
 			};
 
@@ -891,22 +901,47 @@ API.v1.addRoute(
 	},
 );
 
-API.v1.addRoute(
+type WithUserId = GroupsBaseProps & { userId: string };
+const withUserIdSchema = withGroupBaseProperties(
+	{
+		userId: {
+			type: 'string',
+		},
+	},
+	['userId'],
+);
+
+const withUserIdProps = ajv.compile<WithUserId>(withUserIdSchema);
+
+const groupsEndpoints = API.v1.post(
 	'groups.removeModerator',
-	{ authRequired: true },
 	{
-		async post() {
-			const findResult = await findPrivateGroupByIdOrName({
-				params: this.bodyParams,
-				userId: this.userId,
-			});
+		authRequired: true,
+		body: withUserIdProps,
+		response: {
+			400: validateBadRequestErrorResponse,
+			401: validateUnauthorizedErrorResponse,
+			200: ajv.compile<void>({
+				type: 'object',
+				properties: {
+					success: { type: 'boolean', enum: [true] },
+				},
+				required: ['success'],
+				additionalProperties: false,
+			}),
+		},
+	},
+	async function action() {
+		const findResult = await findPrivateGroupByIdOrName({
+			params: this.bodyParams,
+			userId: this.userId,
+		});
 
-			const user = await getUserFromParams(this.bodyParams);
+		const user = await getUserFromParams(this.bodyParams);
 
-			await removeRoomModerator(this.userId, findResult.rid, user._id);
+		await removeRoomModerator(this.userId, findResult.rid, user._id);
 
-			return API.v1.success();
-		},
+		return API.v1.success();
 	},
 );
 
@@ -1300,3 +1335,10 @@ API.v1.addRoute(
 		},
 	},
 );
+
+type GroupEndpoints = ExtractRoutesFromAPI<typeof groupsEndpoints>;
+
+declare module '@rocket.chat/rest-typings' {
+	// eslint-disable-next-line @typescript-eslint/naming-convention, @typescript-eslint/no-empty-interface
+	interface Endpoints extends GroupEndpoints {}
+}
diff --git a/packages/rest-typings/src/v1/groups/GroupsRemoveModeratorProps.ts b/packages/rest-typings/src/v1/groups/GroupsRemoveModeratorProps.ts
deleted file mode 100644
index c9dbd069094bd..0000000000000
--- a/packages/rest-typings/src/v1/groups/GroupsRemoveModeratorProps.ts
+++ /dev/null
@@ -1,5 +0,0 @@
-import type { WithUserId } from './BaseProps';
-import { withUserIdProps } from './BaseProps';
-
-export type GroupsRemoveModeratorProps = WithUserId;
-export const isGroupsRemoveModeratorProps = withUserIdProps;
diff --git a/packages/rest-typings/src/v1/groups/groups.ts b/packages/rest-typings/src/v1/groups/groups.ts
index a7c937b08a9fc..ea4f20d92b94b 100644
--- a/packages/rest-typings/src/v1/groups/groups.ts
+++ b/packages/rest-typings/src/v1/groups/groups.ts
@@ -24,7 +24,6 @@ import type { GroupsModeratorsProps } from './GroupsModeratorsProps';
 import type { GroupsOnlineProps } from './GroupsOnlineProps';
 import type { GroupsOpenProps } from './GroupsOpenProps';
 import type { GroupsRemoveLeaderProps } from './GroupsRemoveLeaderProps';
-import type { GroupsRemoveModeratorProps } from './GroupsRemoveModeratorProps';
 import type { GroupsRemoveOwnerProps } from './GroupsRemoveOwnerProps';
 import type { GroupsRenameProps } from './GroupsRenameProps';
 import type { GroupsRolesProps } from './GroupsRolesProps';
@@ -107,9 +106,7 @@ export type GroupsEndpoints = {
 	'/v1/groups.addModerator': {
 		POST: (params: GroupsAddModeratorProps) => void;
 	};
-	'/v1/groups.removeModerator': {
-		POST: (params: GroupsRemoveModeratorProps) => void;
-	};
+
 	'/v1/groups.addOwner': {
 		POST: (params: GroupsAddOwnerProps) => void;
 	};
diff --git a/packages/rest-typings/src/v1/groups/index.ts b/packages/rest-typings/src/v1/groups/index.ts
index aad463d285c9d..bb2a080b9b7f9 100644
--- a/packages/rest-typings/src/v1/groups/index.ts
+++ b/packages/rest-typings/src/v1/groups/index.ts
@@ -25,7 +25,6 @@ export * from './GroupsOnlineProps';
 export * from './GroupsOpenProps';
 export * from './GroupsRenameProps';
 export * from './GroupsRemoveLeaderProps';
-export * from './GroupsRemoveModeratorProps';
 export * from './GroupsRemoveOwnerProps';
 export * from './GroupsSetAnnouncementProps';
 export * from './GroupsSetCustomFieldsProps';