Internal affairs may refer to:
Government and law
The domestic policy of a sovereign state
Ministry of home affairs, a common type of government department
Department of Internal Affairs, New Zealand
Directorate for Internal Affairs (Jewish Autonomous Oblast), Russia
Internal affairs (law enforcement), a division of a law enforcement agency which investigates cases of police misconduct
Internal affairs doctrine, a choice of law rule in corporations law
Arts and entertainment
Film
Internal Affairs (film), a 1990 American crime thriller
Internal Affairs, a 1988 television film starring Richard Crenna
Literature
Internal Affair, a 2003 novel by Marie Ferrarella
Internal Affairs, a 2009 novel by Jessica Andersen
Television
"An Internal Affairs Affair", The Oldest Rookie episode 10 (1987)
"Internal Affair", Forensic Files season 11, episode 17 (2006)
"Internal Affair", Viper season 3, episode 21 (1998)
"Internal Affairs", Aaahh!!! Real Monsters season 2, episode 2b (1997)
"Internal Affairs", Black Tie Nights season 1, episode 12 (2004)
"Internal Affairs", Cagney & Lacey season 2, episode 6 (1982)
"Internal Affairs", Chicago Hope season 1, episode 19 (1995)
"Internal Affairs", Criminal Minds season 11, episode 9 (2015)
"Internal Affairs", CSI: Miami season 5, episode 12 (2007)
"Internal Affairs (DR-20)", Dragnet (1967) season 3, episode 12 (1968)
"Internal Affairs – Parolee", Dragnet (1967) season 4, episode 10 (1969)
"Internal Affairs", Family Guy season 10, episode 23 (2012)
"Internal Affairs", High Hopes series 6, episode 5 (2008)
"Internal Affairs", Law & Order: Special Victims Unit season 15, episode 4 (2013)
"Internal Affairs", Major Crimes season 3, episode 17 (2015)
"Internal Affairs", NCIS season 5, episode 14 (2008)
"Internal Affairs", New York Undercover season 2, episode 12 (1995)
"Internal Affairs", On the Case with Paula Zahn season 3, episode 7 (2010)
"Internal Affairs", Prodigal Son season 1, episode 12 (2020)
"Internal Affairs", Sidekick season 1, episode 13a (2010)
"Internal Affairs", Silk Stalkings season 1, episode 28 (1992)
"Internal Affairs", Spenser: For Hire season 1, episode 12 (1985)
"Internal Affairs", Strike Force episode 10 (1982)
"Internal Affairs" T.U.F.F. Puppy season 1, episode 6b (2010)
"Intern-al Affairs", Herman's Head season 2, episode 4 (1992)
Music
Internal Affairs (Pharoahe Monch album), 1999
Internal Affairs (The Night Flight Orchestra album), 2012