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|Full name||Stephen Brennan|
|Date of birth||20 March 1983|
|Place of birth||Dublin, Ireland|
|Height||1.79 m (5 ft 10 in)|
|Playing position||Centre midfield|
|Vale View Shankill FC|
|St Joseph's Boys|
|2005||→ Shelbourne (loan)||3||(1)|
|2005–2008||St Patrick's Athletic||86||(1)|
|2002–2004||Republic of Ireland U21||4||(0)|
|1999–2000||Republic of Ireland U16||9||(1)|
|* Senior club appearances and goals counted for the domestic league only.
Brennan played schoolboy football for south Dublin side St Josephs Boys AFC before joining English Premiership side Newcastle United in 1999. In November 2000 he won the FAI's Republic of Ireland Under 16 player of the year award. Brennan came close to making the breakthrough at Newcastle but his time there was blighted by injuries, the worst kept him out of football for ten months in 2003 and made him miss the 2003 FIFA World Youth Championships. He made his debut for the Ireland U21 side in a game with Scotland on 11 February 2002. McCarthy represented the Republic of Ireland Under-16 team at the 2000 UEFA European Under-16 Football Championship and the Under-19 team at the 2002 UEFA European Under-19 Football Championship.
Brennan joined Shelbourne for a short loan spell in March 2005 before being released by Newcastle in the summer. In July 2005 he signed for St Patrick's Athletic and began his career in midfield and then at right back. At the start of the 2006 season an injury to Colm Foley saw Brennan play in central defence alongside Darragh Maguire. On 22 November 2008 he along with 7 other players were released from their contracts.
He finished his career at Bray.