The club was founded on a March evening in 1929[1] when a group of eleven men held a meeting in the then Temperance Hall in High Street, Killarney.

In the Kerry Senior Football Championship, Legion reached the 3rd round by beating John Mitchels of Tralee 0-16 to 1-6, then losing to rivals Dr. Crokes 1-16 to 0-9.

Legion now have a new state of the art clubhouse and have just commenced the development of a stand aligning the southern side of the main pitch.

Killarney Legion GAA came so close to winning the County Championship 2015 after beating Mid Kerry, Feale Rangers, Kerins O' Rahillys and Rathmore.

Legion met South Kerry in the County Final but lost in extra time of a replay.