Guy Thomas (born 30 August 1977) is a New Zealand equestrian. His speciality is show jumping, either individually or as part of a team.

Guy Thomas was born 30 August 1977 in Burson, California, the son of Graeme "Butch" Thomas and Lu Thomas, both former international riders.

Guy Thomas grew up in a riding family. His parents, Graeme "Butch" and Lu Thomas, are highly successful riders and trainers, both having competed in the FEI World Cup Finals. Guy was a natural rider from the time he started riding at the age of two and a half. During his upbringing, rather than exerting pressure to join the family business, his parents pledged their support for whatever life path Guy ultimately chose to pursue.

Guy Thomas competed at the 2004 Summer Olympics in Athens, Greece for the New Zealand Olympic team and also rode for the New Zealand Team at the 2010 World Equestrian Games in Lexington, KY. He qualified for and competed in the 2008 Rolex FEI World Cup Jumping Finals in Gothenburg, Sweden.