St Mary's GAA is a Gaelic Athletic Association club from Ardee, County Louth, Ireland.

The club fields Gaelic football teams in competitions organized by Louth GAA.

[1] In 1955 St Mary's won all three Senior club competitions (Old Gaels Cup, Cardinal O'Donnell Cup and Senior Championship) and went on to repeat this feat in 1956.

[2] As of 2022, the club had competed in 26 Louth Senior Football Championship finals, winning 10.

[3] By 2023, St Mary's had won their 12th county title, after defeating Naomh Máirtín in the 2023 Louth Senior Football Championship final.