Jérôme Dekeyser (born 15 December 1983) is a Belgian international field hockey player for Braxgata in Antwerp who is usually positioned as attacker.
At the 2008 and 2012 Summer Olympics, he competed for the national team in the men's tournament; Belgium qualified for the 2008 Olympic tournament by becoming third at the European Championship in Manchester. At this 2007 European Championship, Dekeyser gave Belgium the lead for the first time against Germany by scoring the 3-2 from a penalty corner. In the first match from Belgium at the Summer Olympics in Beijing against Spain, he scored again at the event of a penalty corner. Belgium lost the game with 4-2. Eventually the Belgian team ended ninth in Beijing. In 2011 Dekeyser placed fourth with Belgium at the European Championship in Germany, and at the 2012 Summer Olympics in London they ended fifth. He became European vice-champion with Belgium at the 2013 European Championship on home ground in Boom.