Yes, you can lock specific chats within WhatsApp using the Chat Lock feature. This feature allows you to secure individual conversations with a fingerprint, face ID, or passcode.
To use it, open the chat you want to lock, tap the contact or group name at the top, select “Chat Lock,” and follow the prompts to set up the lock. Once enabled, the chat will be moved to a Locked Chats folder and require authentication to access.