Christopher Raymond Jack (born 5 September 1978) is a former New Zealand rugby union player who played as a lock.

He played for Canterbury and the Tasman Mako in the National Provincial Championship and its successor, the Air New Zealand Cup; the Crusaders in Super Rugby; Saracens in the Guinness Premiership; and internationally for the New Zealand national team, the All Blacks.

It was announced on 7 June 2006 that Jack had signed a two-year contract with the newly formed Tasman Rugby Union.

He spent two years with the English Premiership side Saracens joining after the 2007 Rugby World Cup,[1] joining another New Zealand player, Glen Jackson.

[4] In 2002, Jack was named the New Zealand rugby player of the year.