Antonio Winterstein (born 30 May 1988) is a former professional rugby league footballer who played for the North Queensland Cowboys and Brisbane Broncos in the NRL.

Born in Auckland, New Zealand he moved to Brisbane in his early years, playing junior rugby league for Logan Brothers, and attended Marsden State High School, where his classmates included future NRL stars Israel Folau and Chris Sandow.

Winterstein's streak of 31 consecutive first grade games since his debut was cut in early April 2010 when coach Ivan Henjak dropped him and Ben Te'o for turning up to training late in the lead up to the match against the Dragons, which the Broncos lost.

At the end of the 2010 NRL season, Winterstein's last with Brisbane, he was part of the New Zealand squad for the 2010 Four Nations[4] but not selected to play in any of the tournament's matches.

[5] Winterstein broke his jaw in the Cowboys first trial of the year in February against his former club Brisbane, which resulted in him missing the first month of the NRL.

After 9 NRL games in 2011, Winterstein tore his pectoral muscle and damaged his shoulder badly in the Round 14 clash against the eventual Premiers Manly.

Winterstein was awarded for his second season with the Cowboys club with a spot in New Zealand's one-off test squad to play against Australia on 13 October 2012.

On 7 December 2012, it was announced that Winterstein had re-signed with the Cowboys on a three-year deal, which will keep the Samoan international at the Townsville-based club until at least the 2016 NRL season.

[12] On 25 July 2018, after playing 16 games in the 2018 NRL season, Winterstein announced his retirement from rugby league, effective immediately, on advice from the club medical staff due to a persistent knee injury.