Ryan Sean O'Donohue (born April 26, 1984) is an American actor. He is most notable for his performances as a voice actor in many Disney projects especially as Demyx in the Kingdom Hearts video game franchise. As a live-action actor, he was part of the main cast of The Byrds of Paradise.

Early life and career
O'Donohue was born in Pomona, California on April 26, 1984 to Anita Lynne (née Rultenberg) and Sean Patrick O'Donohue. He was raised in San Dimas, California. He has a younger sister named Windy. O'Donohue played Zeke Byrd on the 1994 ABC drama The Byrds of Paradise, filmed in Hawaii. TV producer Steven Bochco was one of the show's executive producers.

Personal life
O'Donohue married Veronica Faye Dean in June 2004. They have one child, a daughter, named Hazel Ryan O'Donohue, who was born in December 2004. They live in Los Angeles, California.