Mark Gleghorne (born 19 May 1985) is a field hockey player from Northern Ireland who has represented Ireland, England and Great Britain at international level. He represented Great Britain at the 2016 Summer Olympics. Gleghorne was a member of the England teams that won the bronze medals at the 2014 and 2018 Commonwealth Games and at the 2017 Men's EuroHockey Nations Championship. He also represented England at the 2014 and 2018 Men's Hockey World Cups. At club level, Gleghorne was a member of the Instonians team that won the Irish Senior Cup in both 2002 and 2004. He was also a member of the Punjab Warriors team that won the 2016 Hockey India League title. Gleghorne is a member of a family of field hockey internationals. His younger brother, Paul, is an Ireland international. Two of his aunts, Margaret Gleghorne and Jackie McWilliams, were also Ireland and Great Britain women's internationals.