Trent Lucas Sainsbury (born 5 January 1992) is an Australian professional soccer player who plays for Central Coast Mariners.

[5] Trent and Mariners teammate Marc Warren were selected to spend two weeks at Sheffield United's Academy as part of the two clubs' partnership.

[6] His senior debut came for the Mariners on 24 November 2010 in an F3 Derby draw with Newcastle Jets, with Sainsbury earning praise from coach Graham Arnold for his performance.

[3] After breaking into the first team in the 2012-13 A-League season, Sainsbury formed a formidable partnership alongside Dutch defender Patrick Zwaanswijk.

[12] Following the game, it was speculated that Sainsbury had attracted serious interest from European clubs including Southampton, Roda JC, Basel and Middlesbrough.

Sainsbury scored his first competitive goal for the Mariners on 3 April 2013, in a win over Guizhou Renhe in the 2013 AFC Champions League, his header with under ten minutes remaining proving to be the winner.

[21] Sainsbury was immediately placed in the starting line-up, making his Eredivisie debut on 6 February 2014 in an away game against FC Utrecht.

PEC won the game 2–1, but Sainsbury had to be replaced after 72 minutes after falling on a depressed sprinkler, hurting his knee in the process.

[23] Recovered from his knee injury, Sainsbury was reinstated in PEC's starting lineup for their first game of the season - the 2014 Dutch Supercup.

Sainsbury was part of a defence that kept a clean sheet in a 1–0 win, securing PEC's second major trophy in the club's history in the space of 4 months.

In January 2016, Sainsbury left PEC Zwolle on a $1.5 million transfer and signed a 3-year deal with Chinese Super League club Jiangsu Suning.

[26] He made his debut on 28 May 2017 in a 5–2 win over Udinese in the last round of the season, coming on as a substitute for Davide Santon with twenty minutes to play.

[44] He also played for the squad for the 2008 AFC U-16 Championship, scoring a goal in a loss to the UAE in the quarter-finals which saw Australia miss out on qualification for the 2009 FIFA U-17 World Cup.

[53] He also started Australia's second group game against Oman, providing the assist for Matt McKay to open the scoring in a 4-0 win by heading a Massimo Luongo corner goalwards.

Under three minutes into the game, he headed a corner from Massimo Luongo in at the far post to give Australia the lead in a match they ultimately won 2–0.

[55] He also played for Australia in the Final victory over South Korea and was named as Man of the Match following an imposing defensive display.