|Full name||Jason Paul Cayless|
|Born||15 January 1980|
Sydney, New South Wales, Australia
|Height||194 cm (6 ft 4 in)|
|Weight||108 kg (17 st 0 lb)|
Jason Paul Cayless (born 15 January 1980) is a former New Zealand international rugby league footballer who played as a prop in the 2000s and 2010s. He played for the Parramatta Eels, Sydney Roosters and the Wests Tigers in the NRL and St Helens in the Super League.
He won the 2002 Telstra Premiership and the 2003 World Club Challenge with the Roosters, and the 2006 Challenge Cup, 2006 Super League Grand Final, 2007 Challenge Cup and the 2007 World Club Challenge with the Saints.
In 2001 he made his representative début for New South Wales Country Origin.
Having won the 2002 NRL Premiership, the Roosters traveled to England to play the 2003 World Club Challenge against Super League champions, St Helens. Cayless played at prop forward in Sydney's victory.
After spending four seasons in the Super League, in October 2009 Cayless signed with the Wests Tigers on a two-year contract starting in 2010. He started the first three games of the season from the bench, but injuries saw him make no further appearances for the Tigers in 2010. He announced his retirement before the start of the 2011 season.
- First Grade Debut: Round 21, Parramatta v Wests Tigers at Parramatta Stadium, 25 June 2000
- National Representation: 11 Tests for New Zealand
- NRL Premiership Winner: 2002 for Sydney Roosters
- Super League Championship Winner: 2006 for St Helens
- Carnegie Challenge Cup Winner: 2006 for St Helens
- World Club Challenge Winner: 2007 for St Helens
- League Central
- "Statistics at rugbyleagueproject.org". rugbyleagueproject.org. 31 December 2017. Retrieved 1 January 2018.
- CAYLESS, JASON PAUL 2002 – 2006 – KIWI #699 Archived 2 April 2012 at the Wayback Machine nzleague.co.nz
- "Rugby League: Nikau delighted with Maori squad".
- "Jason Cayless signs two-year deal with Wests Tigers". Fox Sports News (Australia). 14 October 2009. Retrieved 14 October 2009.