Nicholas Grant Billson Cook (born 17 June 1956) is an English cricket umpire and former player who appeared in 15 Tests and three ODIs between 1983 and 1989.

[1] A slow left-arm orthodox spin bowler and a lower order right-handed batsman, he played first-class and List A cricket from 1978 to 1994.

One of three England debutants in the match along with Neil Foster and Chris Smith, Cook was called up because of an injury to Phil Edmonds,[2] which occurred so late that Cook had already started playing in a County Championship match against Essex and had to be replaced by Jonathan Agnew as full substitute.

[3] He picked up 32 wickets in his first four Tests, taking four five-fors, including one on debut (after he had been called up at short notice),[4] and a best bowling match return of 11 for 83 against Pakistan at Karachi.

Since retiring from the game, Cook has become an umpire and in November 2008, was promoted to the ECB full list for the 2009 season.