diff --git a/src/api/controllers/chat.controller.ts b/src/api/controllers/chat.controller.ts
index 1c16260d..9d22a8f0 100644
--- a/src/api/controllers/chat.controller.ts
+++ b/src/api/controllers/chat.controller.ts
@@ -4,6 +4,7 @@ import {
   BlockUserDto,
   DeleteMessage,
   getBase64FromMediaMessageDto,
+  MarkChatUnreadDto,
   NumberDto,
   PrivacySettingDto,
   ProfileNameDto,
@@ -40,6 +41,11 @@ export class ChatController {
     return await this.waMonitor.waInstances[instanceName].archiveChat(data);
   }
 
+  public async markChatUnread({ instanceName }: InstanceDto, data: MarkChatUnreadDto) {
+    logger.verbose('requested markChatUnread from ' + instanceName + ' instance');
+    return await this.waMonitor.waInstances[instanceName].markChatUnread(data);
+  }
+
   public async deleteMessage({ instanceName }: InstanceDto, data: DeleteMessage) {
     logger.verbose('requested deleteMessage from ' + instanceName + ' instance');
     return await this.waMonitor.waInstances[instanceName].deleteMessage(data);
diff --git a/src/api/dto/chat.dto.ts b/src/api/dto/chat.dto.ts
index 0178de2a..7952ddc6 100644
--- a/src/api/dto/chat.dto.ts
+++ b/src/api/dto/chat.dto.ts
@@ -73,6 +73,11 @@ export class ArchiveChatDto {
   archive: boolean;
 }
 
+export class MarkChatUnreadDto {
+  lastMessage?: LastMessage;
+  chat?: string;
+}
+
 class PrivacySetting {
   readreceipts: WAReadReceiptsValue;
   profile: WAPrivacyValue;
diff --git a/src/api/routes/chat.router.ts b/src/api/routes/chat.router.ts
index e8c82a16..4debf3d1 100644
--- a/src/api/routes/chat.router.ts
+++ b/src/api/routes/chat.router.ts
@@ -6,6 +6,7 @@ import {
   blockUserSchema,
   contactValidateSchema,
   deleteMessageSchema,
+  markChatUnreadSchema,
   messageUpSchema,
   messageValidateSchema,
   presenceSchema,
@@ -24,6 +25,7 @@ import {
   BlockUserDto,
   DeleteMessage,
   getBase64FromMediaMessageDto,
+  MarkChatUnreadDto,
   NumberDto,
   PrivacySettingDto,
   ProfileNameDto,
@@ -98,6 +100,23 @@ export class ChatRouter extends RouterBroker {
 
         return res.status(HttpStatus.CREATED).json(response);
       })
+      .put(this.routerPath('markChatUnread'), ...guards, async (req, res) => {
+        logger.verbose('request received in markChatUnread');
+        logger.verbose('request body: ');
+        logger.verbose(req.body);
+
+        logger.verbose('request query: ');
+        logger.verbose(req.query);
+
+        const response = await this.dataValidate<MarkChatUnreadDto>({
+          request: req,
+          schema: markChatUnreadSchema,
+          ClassRef: MarkChatUnreadDto,
+          execute: (instance, data) => chatController.markChatUnread(instance, data),
+        });
+
+        return res.status(HttpStatus.CREATED).json(response);
+      })
       .delete(this.routerPath('deleteMessageForEveryone'), ...guards, async (req, res) => {
         logger.verbose('request received in deleteMessageForEveryone');
         logger.verbose('request body: ');
diff --git a/src/api/services/channels/whatsapp.baileys.service.ts b/src/api/services/channels/whatsapp.baileys.service.ts
index 7e2f8d88..ebf6d740 100644
--- a/src/api/services/channels/whatsapp.baileys.service.ts
+++ b/src/api/services/channels/whatsapp.baileys.service.ts
@@ -68,6 +68,7 @@ import {
   DeleteMessage,
   getBase64FromMediaMessageDto,
   LastMessage,
+  MarkChatUnreadDto,
   NumberBusiness,
   OnWhatsAppDto,
   PrivacySettingDto,
@@ -2714,6 +2715,45 @@ export class BaileysStartupService extends ChannelStartupService {
     }
   }
 
+  public async markChatUnread(data: MarkChatUnreadDto) {
+    this.logger.verbose('Marking chat as unread');
+
+    try {
+      let last_message = data.lastMessage;
+      let number = data.chat;
+
+      if (!last_message && number) {
+        last_message = await this.getLastMessage(number);
+      } else {
+        last_message = data.lastMessage;
+        last_message.messageTimestamp = last_message?.messageTimestamp ?? Date.now();
+        number = last_message?.key?.remoteJid;
+      }
+
+      if (!last_message || Object.keys(last_message).length === 0) {
+        throw new NotFoundException('Last message not found');
+      }
+
+      await this.client.chatModify(
+        {
+          markRead: false,
+          lastMessages: [last_message],
+        },
+        this.createJid(number),
+      );
+
+      return {
+        chatId: number,
+        markedChatUnread: true,
+      };
+    } catch (error) {
+      throw new InternalServerErrorException({
+        markedChatUnread: false,
+        message: ['An error occurred while marked unread the chat. Open a calling.', error.toString()],
+      });
+    }
+  }
+
   public async deleteMessage(del: DeleteMessage) {
     this.logger.verbose('Deleting message');
     try {
diff --git a/src/api/services/channels/whatsapp.business.service.ts b/src/api/services/channels/whatsapp.business.service.ts
index d55f72e8..09ddd2a0 100644
--- a/src/api/services/channels/whatsapp.business.service.ts
+++ b/src/api/services/channels/whatsapp.business.service.ts
@@ -1258,6 +1258,9 @@ export class BusinessStartupService extends ChannelStartupService {
   public async archiveChat() {
     throw new BadRequestException('Method not available on WhatsApp Business API');
   }
+  public async markChatUnread() {
+    throw new BadRequestException('Method not available on WhatsApp Business API');
+  }
   public async fetchProfile() {
     throw new BadRequestException('Method not available on WhatsApp Business API');
   }
diff --git a/src/validate/validate.schema.ts b/src/validate/validate.schema.ts
index 9013ca39..8f7cb1a0 100644
--- a/src/validate/validate.schema.ts
+++ b/src/validate/validate.schema.ts
@@ -597,6 +597,33 @@ export const archiveChatSchema: JSONSchema7 = {
   required: ['archive'],
 };
 
+export const markChatUnreadSchema: JSONSchema7 = {
+  $id: v4(),
+  type: 'object',
+  properties: {
+    chat: { type: 'string' },
+    lastMessage: {
+      type: 'object',
+      properties: {
+        key: {
+          type: 'object',
+          properties: {
+            id: { type: 'string' },
+            remoteJid: { type: 'string' },
+            fromMe: { type: 'boolean', enum: [true, false] },
+          },
+          required: ['id', 'fromMe', 'remoteJid'],
+          ...isNotEmpty('id', 'remoteJid'),
+        },
+        messageTimestamp: { type: 'integer', minLength: 1 },
+      },
+      required: ['key'],
+      ...isNotEmpty('messageTimestamp'),
+    },
+  },
+  required: ['lastMessage'],
+};
+
 export const deleteMessageSchema: JSONSchema7 = {
   $id: v4(),
   type: 'object',