Big Brother: Over the Top (BBOTT) is a spin-off American reality television series of the show Big Brother that aired exclusively online. The show premiered on September 28, 2016, and ended after 65 days with a season finale on December 1, 2016, only on CBS All Access, an over-the-top subscription streaming service. The spin-off was officially announced by CBS on August 3, 2016, while Big Brother 18 was still in progress.

As with the televised series, the group of contestants—referred to as HouseGuests—are enclosed in the Big Brother House under constant surveillance of cameras and microphones. Each week a HouseGuest was evicted until the final three HouseGuests remain on finale night. Unlike in Big Brother, the viewers voted to crown a winner. Julie Chen hosted the season premiere and finale, and conduct weekly eviction interviews. In the season finale, the voting public awarded Morgan Willett with the $250,000 grand prize over Jason Roy and Kryssie Ridolfi.

What separated this from the main televised series was that the live feed was emphasised in this series, with significantly less feed blockage. For example, the live feed showed the house guests moving in and meeting one another, something that had never been shown live or unedited. Additionally, viewers got to see all the games's ceremonies and competitions from start to finish, which are rarely shown on the live feed for the main series, save for occasional Endurance competitions. Additionally, the involvement of the viewers was greatly increased, with several regular weekly “America's Vote” voting occurring each week.