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.
The club was founded in 1928. 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. As of 2022, the club had competed in 26 Louth Senior Football Championship finals, winning 10. By 2023, St Mary's had won their 12th county title, after defeating Naomh MáirtÃÂn in the 2023 Louth Senior Football Championship final.
The club won a third consecutive Joe Ward Cup in 2024, again overcoming Naomh MáirtÃÂn in the final, by 2-02 to 0-04. St Mary's went on to reach the final of the Leinster Senior Club Football Championship, losing by one point to Cuala of Dublin at Croke Park.
As of 2025, Down-native Cathal Murray was the senior team manager.