St Brendan's Park, known for sponsorship reasons as Grant Heating St. Brendan's Park, is a GAA stadium in Birr, County Offaly, Ireland. It is one of the main grounds of Offaly's Gaelic football and hurling teams. The ground has a capacity of 8,800. Prior to the development of O'Connor Park in Tullamore, the ground was the base of Offaly hurling and played host to intercounty competitions and to the Offaly hurling county final. Most Offaly games have since transferred to Tullamore. The stadium is named for the local patron saint Brendan of Birr, not to be confused with the more famous Brendan the Navigator.