Andrew Tiernan
- Birthday: 1965-11-30
- Place of birth: Ladywood, Birmingham, England, UK
- Also know as: Andy Tiernan
Andrew Tiernan (born 30 November 1965, Birmingham, England) is a British actor and director. He is best known as Ephialtes in 300 (2006) and 300: Rise of an Empire (2014), Sean Kerrigan in Cracker (1993), and for roles in Interview with the Vampire (1994), The Pianist (2002), and My Policeman (2022). On television he has appeared in Prime Suspect, Hornblower, Doctor Who (2011), Merlin (2012), and Father Brown. As a director and producer, he founded Keeps on Burning Films and directed Dragonfly (2015) and UK18 (2017).
