Gerard Eamonn Greene (born 12 November 1973 in Chatham, Kent) is a Northern Irish former professional snooker player.

Alongside this, Greene reached a ranking semi-final, at the 2007 Grand Prix, losing to the eventual champion Marco Fu, and five quarter-finals.

Greene has qualified for the World Championship five times without winning a match at the Crucible Theatre, although he twice drew the defending champion – John Higgins in 1999, and Peter Ebdon in 2003.

He started the 2003/04 season in superb form reaching the British Open quarter final and the last 32 of the UK Championship beating Joe Swail 9–4 in the first round, then losing 9–7 to Matthew Stevens.

Greene came through Group B which included Ronnie O'Sullivan, Steve Davis, Dominic Dale and qualifiers Tom Ford and Mark Joyce.

[7] He played in all 12 of these minor-ranking events and reached the last 16 on three occasions, which helped him finish 25th on the Order of Merit to qualify for the Finals, where he was defeated 2–4 by Matthew Stevens in the first round.

[10] He also did not fare well in the Players Tour Championship events as he took part in all 12 of them but only advanced to the last 16 once to finish 57th on the PTC Order of Merit and 42nd in the world rankings.

He won four matches to reach the quarter-finals where he beat Joe Swail 4–1, then held his nerve against Ali Carter to win 4–3 after leading 3–0.

At the Ruhr Open Greene made the highest break of his professional career, a 144 in a 4–0 first round win over Germany's Phil Barnes.

[18] The wins kept on coming for Greene as he knocked out number one seed Mark Allen 4–2 and Marco Fu 4–2 to play in his first ranking event final.

[20] He played practice partner Barry Hawkins in the final and did not pot a ball in the first two frames and went on to be beaten 4–0, but the £38,000 runner-up's cheque is the biggest of his career to date.

[25] At the Welsh Open, Greene won his first match defeating Daniel Wells, but then suffered a whitewash at the hands of in form Liang Wenbo in the second round.

[27] Greene beat the in form Chris Wakelin 5–1 to qualify for the China Open, but was then beaten 5–2 by practice partner Barry Hawkins at the main venue.

[32] A 5–0 thrashing of David Morris saw Greene qualify for the Australian Goldfields Open, but he was the victim of a 5–0 defeat in the first round to Michael Holt.

[33] Greene qualified for the Paul Hunter Classic and beat Hatem Yassin 4–0, Stuart Bingham 4–3 and Michael Georgiou 4–1, before being thrashed 4–0 by Jamie Jones in the fourth round.