Seán Martin Lockhart (born 22 August 1976) is an Irish Gaelic footballer who plays for Derry.
He has won an Ulster Senior Football Championship and three National League titles with the county, as well an All-Ireland Under 21 Championship.
He also won an All Star for his performances in the 1998 All-Ireland Senior Football Championship.
Lockhart plays his club football for St.
Mary's Banagher.
He is a dual player in that he also plays hurling for Banagher, and has in the past also hurled for Derry.
In football, he is seen as a mobile, very tight marking corner-back, who is also very competent with the ball in his hands going forward, proven by the fact he plays midfield for his club.
He has won three Irish News Ulster All-Star awards (1998, 1999 and 2001) and was named left-corner back on the Irish News Team of the Decade in 2004.
Lockhart holds the record for the highest number of appearances in the International Rules Series, having represented Ireland sixteen times over the course of eight series (1998-2006)