A blood brother is a male who swears loyalty to another male.
Blood Brother, Blood Brothers, Bloodbrothers, or The Blood Brothers may also refer to:
- The Blood Brothers (1973 film), a Hong Kong film by Chang Cheh
- Blood Brothers (1975 film), an East German film by Werner W. Wallroth
- Bloodbrothers (1978 film), a film starring Richard Gere, based on a novel by Richard Price (see below)
- Blood Brothers (1993 film), a made-for-television film featuring Richard Yearwood
- Blood Brothers (film series), a 1993 Australian documentary series (four films)
- Blood Brothers (1996 film), a documentary about a Bruce Springsteen and The E Street Band reunion
- Blood Brothers (2004 film) (Jiang Hu), a Hong Kong gang film
- Bloodbrothers (2005 film), a Swedish film starring Sofia Helin
- Blood Brothers (2007 Chinese film), a Chinese film by Alexi Tan
- The Warlords or The Blood Brothers, a 2007 Chinese film
- Blood Brothers (2007 Indian film), an AIDS-awareness film produced by the Bill Gates foundation
- Blood Brothers (2011 film), an Australian TV film featuring Cariba Heine
- Blood Brother (2013 film), a 2013 Sundance Film Festival documentary
- Blood Brother (2018 film), a WWE film
- The Blood Brothers (2024 film), a Philippine film directed by Cesar Montano