It was formed on 1 December 2005 as the result of a merger of St Grellan's GFC and Ballinasloe Hurling Club.

[1] Ballinasloe's first ever hurling game took place on The Fair Green on Easter Monday 1884 between Killimor and Eyrecourt.

The first football game in Ballinasloe GAA's successful history took place on 31 March 1893 in a field in Pollboy.

Late that year in June 1893, Ballinasloe fulfilled another fixture where they were welcomed out to Kiltormer to take on Killoran in a gaelic football game under GAA rules.

Ballinasloe's association with Gaelic games can be traced back beyond an inaugural meeting of the GAA which was held in Thurles on 1 November 1884; on an earlier date in 1884, Killimor and the Dublin Metropolitan Hurling team played a hurling challenge in Ballinasloe and included in that Dublin team was Michael Cusack who later in the same year, was to be a founder member of the association.