Conleith "Deets" Gilligan (Irish: Conláed Mac Giollagáin; born 17 December 1979) is an Irish Gaelic footballer who played for Derry, with whom he won two National League titles.
Gilligan plays his club football for Ballinderry Shamrocks.
He was instrumental in helping Ballinderry win the 2002 All-Ireland Senior Club Football Championship, and he has also won four Derry Championships and an Ulster Senior Club Football Championship with the club.
Gilligan usually plays as a playmaker in the forward line and his vision and ability to pick out pin-point passes is well renowned.