Tristan Malcolm Knowles, OAM[1] (born 25 April 1983) is an Australian wheelchair basketball player and won a gold medal at the 2008 Beijing Paralympics and silver medals at the 2004 Athens and 2012 London Paralympics.

The state U21 team won the national championships four years in a row with Knowles as the captain.

[4] Knowles was part of the silver medal-winning Australia men's national wheelchair basketball team at the 2004 Summer Paralympics.

[9] At the 2012 Summer Paralympics he was part of the Australian men's wheelchair team that won silver.

[10] In 2016, he was selected for the 2016 Summer Paralympics in Rio de Janeiro, his fourth games,[11] where his team, The Rollers, finished sixth.

[19] In 2018, he was a member of the Rollers that won the bronze medal at 2018 Wheelchair Basketball World Championship in Hamburg, Germany.

[22] In 2004, Knowles and Brendan Dowler received the Illawarra Mercury Sports Star of the Year Award.