| Club Gaa: | St Mary's GAA |
| Irish: | Naomh Mhuire CLG |
| Crest: | St_Marys_GAA.jpg |
| Founded: | 1906 |
| Province: | Leinster |
| County: | Dublin |
| Nickname: | Marys |
| Colours: | Blue and Green |
| Grounds: | Saggart |
| Coordinates: | 53.2793°N -6.443°W |
| Pattern La: | _green_hoops |
| Pattern B: | _greenVtop |
| Pattern Ra: | _green_hoops |
| Leftarm: | 0000FF |
| Body: | 0000FF |
| Rightarm: | 0000FF |
| Shorts: | FFFFFF |
| Socks: | 0000FF |
| F3: | 1 |
| F2: | 0 |
| F1: | 0 |
St Mary's is a Gaelic Athletic Association club based in Saggart, County Dublin, Ireland. Mary's have won the Dublin Senior Football Championship on one occasion in 1921. Since then they had been relegated to the Dublin Intermediate Football Championship and regained their senior status in 1976 and have remained a Senior club ever since. St Mary's currently play in the Dublin AFL Division 1.
Five St Mary's players were on the Dublin team which won the 1942 All Ireland Final against Galway. The five players were Paddy Bermingham, Gerry Fitzgerald, Peter O'Reilly, Caleb Crone and Paddy O'Connor. Caleb Crone also won an All-Ireland medal with Cork in 1945.