Cormac Costello (born 18 July 1994) is a Gaelic football forward for Dublin, with whom he has won three All-Ireland Senior Football Championship medals and four National Football League medals.
The former Ardscoil RÃs student plays his club football for Whitehall Colmcille.
Costello won an All-Ireland Minor Football Championship in 2012, then an All-Ireland Under 21 Football Championship in May 2014.
In 2014, he was a sub in the quarter-final victory over Laois in the Leinster Senior Championship.
He scored three points in the game.
During the semi-final victory over Wexford he was a sub again and he scored 1-05.
He won a Leinster Senior Championship against Meath in 2014.
He was a sub and scored one point in the game.
In the All-Ireland quarter-final Costello was a sub again and managed one point in a one-sided game against Monaghan.
He was selected at corner forward against Donegal but Dublin crashed out in the semi-final.On 1 October 2016, Costello come off the bench and scored three points as Dublin won the All-Ireland final after a replay with Mayo.