Red Flag can refer to one of the following:
- Red flag, a socialist and communist emblem
- Red Flag, or Hongqi, a Chinese journal
- Red Flag, or Hongqi, a luxury limousine made by First Automobile Works in China from late 50's
- Red Flag (band), synthpop band founded in 1984
- Red Flag (Jericho episode), an episode of the CBS drama, Jericho.
- Red flag (signal), an attention marker
- Red Flag (song), a song by Billy Talent on album Billy Talent II
- Red Flag (USAF) (a.k.a. "Operation Red Flag"), a military training exercise
- Red Flag Act, the 19th century British road law
- Red Flag Linux, the Chinese Linux distribution
- Red Flag Party, a communist party in Venezuela
- Red flag warning, a term used by meteorologists
- Red racing flag, used to temporarily stop the race for cleanup
- Bandiera Rossa Association (Italy), the Italian affiliate of the United Secretariat of the Fourth International
- A red flag used in challenging a play in American Football
- The Red Flag (anthem)
- Red Flags and Long Nights is a song by the band She Wants Revenge
