Formed in 1963, the Portadown-based side currently play in the NIFL Championship after gaining promotion as Premier Intermediate League champions at the end of the curtailed 2019/20 season.

Annagh were admitted to the third level Second Division for the 2003/04 campaign, finishing 11th out of 12 teams. However, a few seasons of consolidation followed during which Annagh regularly finished mid-table before, at the end of the 2014/15 season, a second placed finish was secured and with it promotion to the Championship.

A couple of season in the Championship saw Annagh struggle in the lower reaches resulting in relegation back to the Premier Intermediate League. A 10th place finish in 2017/18 as the club regrouped was then followed by securing the runners-up spot and a promotion play-off defeat to PSNI.

However, Annagh went one better the following season, being declared winners of the PIL and clinching a return to the Championship.