Katayoun Riahi (born 31 December 1961 in Tehran) is an Iranian actress. She is also the founder and CEO of the Komak Charity Foundation.She left the film industry in 2009.She is also an ambassador of the Mehrafarin Foundation in Iran.
It was with the series Days of Life (1998), After the Rain (1999) and The 10th Night (2001) that she established herself as a capable actress.
She also played a starring role in the series Prophet Joseph (2009).
Many critics believe that Riyahi's best performance was in the movie The Last Supper (2001), a role which brought her a Best Actress nomination at the 20th Fajr International Film Festival.
Her outstanding performance in the movie This Woman Won't Talk (2002) wins a nomination for the Best Actress Award at the 7th Iran Cinema Celebration.
Riyahi has also appeared in a number of movies, including The Stranger (1987), Apartment 13 (1990), The Kind Moon (1995), Lighter Than Darkness (2002) and Invitation (2008).