Susan Lynch (born 5 June 1971) is an actor from Northern Ireland.

She is known for her role in the 2003 film 16 Years of Alcohol. Her other film appearances include Waking Ned Devine (1998), Nora (2000), Beautiful Creatures (2000), and From Hell (2001). Lynch was born in 1971 in Corrinshego, County Armagh, Northern Ireland to an Italian mother (from Trivento) and an Irish father. She has four siblings; her eldest brother is actor John Lynch. She trained at the Central School of Speech and Drama. Lynch has won three Irish Film and Television Academy Awards, including Best Leading Actress for her work in the film Nora, about Nora Barnacle and her husband, Irish author James Joyce. She also won the British Independent Film Award for Best Supporting Actress for the 2003 film 16 Years of Alcohol. In 2020, she was listed as number 42 on The Irish Times list of Ireland's greatest film actors.