Castlederg St Eugene's (Irish: Caisleán na Deirge Naoimh Eoghain) is a Gaelic Athletic Association club.

The club is based in Castlederg in County Tyrone, Northern Ireland.

The club was formed in 1975 under the name Naomh Eoghan Caisleán na Deirge C.L.G and has been in continuous existence ever since.

For the most part of the club's existence they have played their adult football at Junior level.

The senior team competed in Division 3 of the Tyrone All-County Football League and in the Tyrone Junior Football Championship up until they gained promotion in 2016 by finishing top of the League, just a single point above Tattyreagh, after a victory over Glenelly (1-14 to 1–8) on the final day of the season.