The 2015 North Queensland Cowboys season was the 21st in the club's history. Coached by Paul Green and co-captained by Johnathan Thurston and Matthew Scott, they competed in the NRL's 2015 Telstra Premiership. The Cowboys celebrated 20 years as a club in 2015 and played in the first all-Queensland grand final, defeating the Brisbane Broncos 17-16 in golden point to win their first premiership.

After going through their pre-season trials undefeated, the Cowboys started their 2015 season with three straight losses. The side hit back with three consecutive wins on Monday Night Football over the Melbourne Storm, Penrith Panthers and South Sydney Rabbitohs, on their way to a club record 11 game winning streak. The Cowboys finished in 3rd place, winning 17 games, giving the club their most successful regular season in its history.

The NRL Auckland Nines is a pre-season rugby league nines competition featuring all 16 NRL clubs. The 2015 competition was played over two days on January 31 and February 1 at Eden Park in Auckland, New Zealand. The Cowboys featured in the Waiheke pool and played Melbourne, Penrith and South Sydney. The top two teams of each pool qualified for the quarter finals. The Cowboys, who were the defending champions, were knocked out in the quarter-finals.

The following players have played a representative match in 2015

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