Big Brother is an American television reality competition show based on the Dutch reality show of the same name created by producer John de Mol Jr. in 1997. The series takes its name from the character in George Orwell's 1949 novel Nineteen Eighty-Four. The American series launched on July 5, 2000 on CBS, and since the discontinuation of the Spanish version in 2022, is the longest-running adaptation in the Big Brother franchise.

Big Brother is a character and symbol in George Orwell's dystopian 1949 novel Nineteen Eighty-Four. He is ostensibly the leader of Oceania, a totalitarian state wherein the ruling party, Ingsoc, wields total power "for its own sake" over the inhabitants.