Reuben David Thorne (born 2 January 1975) is a New Zealand rugby union player, and former captain of the national team, the All Blacks.

Although the team's record was excellent under Thorne's leadership (playing 22 test matches for 19 wins and 3 losses, and winning the Tri Nations Series both years and the Bledisloe Cup in 2003), his captaincy ended on a low note as the team was eliminated by the Wallabies in the semi-finals of the 2003 Rugby Union World Cup.

Thorne appeared again for the All Blacks on the 2004 end of year tour, where he was an unused reserve against Wales at the Millennium Stadium in Cardiff and started as a lock against the Barbarians at Twickenham.

On 28 May 2006 Thorne was named captain for the 2006 Junior All Blacks season [1], but the next day he withdrew from the squad to undertake "a recovery and reconditioning programme."

He returned to play for the Crusaders that year, and was picked in the All Blacks squad for the 2007 Tri Nations Series and the 2007 Rugby World Cup.