Brett Kirk (born 25 October 1976) is a former Australian rules football player and captain of the Sydney Swans and was the AFL's International Ambassador.

He was recruited to the Sydney Swans as a mature-aged rookie in 1996 but twice dropped from the team after playing in the reserves competition, but he found his way back onto the list.

Kirk made his debut in Round 19 of the 1999 season against the North Melbourne Kangaroos and recorded 19 disposals and kicked 3 goals.

Kirk became a premiership player when the Swans defeated the West Coast Eagles by 4 points in the 2005 AFL Grand Final.

He performed strongly all season, and the Swans again matched up against the Eagles in the 2006 AFL grand final, in which Kirk recorded 27 disposals and laid 9 tackles.

Kirk carried his consistency into the 2008 AFL season and played 24 games and racked up 539 disposals, along with 151 tackles, his highest tally in his career so far.

He surpassed Jared Crouch's Swans record of 194 consecutive AFL matches in the game against Geelong in round 18, 2010.

[7] In 2011, he spent six months travelling the world and spreading the word about football as the AFL's International Ambassador.

[8] Prior to that, he worked at the Gold Coast Suns in a role designed to help implement a winning culture at the club.

[12] When the young Swan Dan Hannebery seemed anxious, Kirk recommended that he do some meditation and read The Power of Now and A New Earth by Eckhart Tolle.