Eddie Cahill (born January 15, 1978) is an American actor best known for playing the role of Det. Don Flack on CSI: NY. Cahill was born in New York City, New York. He is of Irish and Italian descent. He played Tag Jones in seven episodes of Friends.

Cahill starred on a short-lived WB drama, Glory Days (2002). His television guest star appearances include Charmed, Felicity, Sex & the City, Dawson's Creek, Haunted, and Law & Order: Special Victims Unit. In the movie Miracle (2004), he played hockey goalie Jim Craig.