Big Brother may refer to:

• Big Brother (1984), a character from the novel Nineteen Eighty-Four
• Authoritarianism, referred to as "Big Brother", any omnipresent, seemingly benevolent figure representing the oppressive control over individual lives exerted by an authoritarian government, a concept from the above novel.
• Surveillance, video surveillance
• Big Brother Award, an award for acts against personal privacy
• Big Brothers Big Sisters of America, a voluntary organization that mentors youth
• Big Brother (TV series), a reality television series, see also:
  • Big Brother (UK TV series)
  • Big Brother (Australian TV series)
  • Big Brother (USA TV series)
  • Big Brother (Swedish TV series)
  • Big Brother Brasil
  • Pinoy Big Brother (Philippine TV series)
• Big Brother (Magazine), a now-defunct skateboarding culture magazine
• Big Brother (Are You Being Served? episode) was an episode of the British comedy.

Music:

• Big Brother (records), the UK record label of Oasis
• Big Brother and the Holding Company, a band from San Francisco's psychedelic era, best known for its most famous lead singer, Janis Joplin
• "Big Brother", a song by Stevie Wonder which appeared on the album Talking Book
• "Big Brother", a song by David Bowie which appeared on the album Diamond Dogs
• "Big Brother", a song by Girls Aloud which appeared on the album What Will The Neighbours Say?
• "Big Brother", a song by Hazel O'Connor which appeared on the film soundtrack Breaking Glass