Kerrigan Mahan (born January 27, 1955 in Encino, CA) is a voice actor who is also known as Ryan O'Flannigan. His voice ranges from young and exuberant (Lensman and Zillion) to sneering and Lee Van Cleef-ish (Vampire Hunter D and Crying Freeman). Mahan is very well known for his voicework as Goldar in Mighty Morphin Power Rangers and Power Rangers: Zeo, Jeb the talking dog in VR Troopers, and (the original) Magna Defender in Power Rangers: Lost Galaxy. His ex-wife is Joyce Kurtz, who also did voicework at Streamline Pictures and Tokyopop.

Mahan has also been involved in theater work, having directed Matty: An Evening With Christy Mathewson, a play based on the life of baseball player Christy Mathewson, who was portrayed by another voice actor, Eddie Frierson.