Secret Story - Casa dos Segredos (occasionally be referred as Casa dos Segredos) is a Portuguese reality competition television show based on the original French series Secret Story and part of the franchise of the same name.

Despite not being an adaptation of the Big Brother franchise, the show has a similar concept. The housemates are cut off from the outside world for ten to fifteen weeks in a house called "house of secrets", where every room is fitted with cameras, except the restroom. They have to keep a secret while trying to discover the other housemates' one.