Maghery Sean MacDermott's GAC (Irish: CLG Sheáin Mhic Diarmada, An Mhachaire) is a Gaelic Athletic Association (GAA) club from Maghery, County Armagh, Northern Ireland.

The club's home ground is Felix Hamill Park which opened in 2003 (formerly St Mary's GAA Park, opened 1956)[1] The club was founded in 1906 and plays in blue with a gold hoop.

The first match to be played on Felix Hamill Park was between Armagh and Westmeath and took place on Sunday 16 March 2003.

The official opening took place on Sunday 13 April 2003 with a blessing by Most Reverend Sean Brady Archbishop of Armagh.

Other guests at the official opening were: Sean Kelly (GAA President), John O'Reilly (Ulster GAA President), Peter Quinn (Former GAA President), Joe Jordan (Armagh County Board) As well as hosting all home games of all Maghery GAC teams, Felix Hamill Park also hosts Armagh club championship games and Ulster Colleges games.