Act III may refer to:
Companies, publications and brands Act III Broadcasting, a defunct American television broadcasting company Act III Theatres, an American movie theater chain acquired in 1998 by Regal Entertainment Group Act III Publishing, a defunct American Trade Magazine publisher active 1985-1991 Act III Communications, an American media and communications company Wyeth Act-3, a drug composed of 'ibuprofen'; see Ibuprofen brand names LGP-30#ACT-III_programming_language, Librascope ACT-III programming language
Music Act III (Death Angel album), 1990 Act III (the Seldom Scene album), 1973 Act III: Life and Death, an album by the Dear Hunter, 2009 Act Three (G4 album), an album by G4, 2006 Act III: This City Made Us, an album by the Protomen, 2026 Act III (Kasabian album), an album by Kasabian, 2026 Act. 3 Chococo Factory, 2017 single album by Gugudan Act III: M.O.T.T.E World Tour, 2017 concert tour
See also Act (drama), a division or unit of a drama Act II (disambiguation)