Mary Tsoni (Greek: Μαίρη Τσώνη; June 25, 1987 – May 8, 2017) was a Greek actress and singer.

She was best known for her roles in the films Evil (2005), Dogtooth and Evil: In the Time of Heroes (both 2009). For her role in Dogtooth, she won the award for Best Actress at the Sarajevo Film Festival, and the motion picture itself was nominated for the Academy Award for Best Foreign Language Film.

Born in Athens, Tsoni was also the lead singer of a punk band called Mary and The Boy and, prior to her acting career, a make-up artist.