John Jermyn (born 30 March 1982) is a former Ireland men's field hockey international. Between 2002 and 2018 Jermyn made 179 appearances and scored 93 goals for Ireland. He represented Ireland at the 2007 and 2011 Men's EuroHockey Nations Championships and at the 2016 Summer Olympics. In 2012, Jermyn set the new record as career top goal scorer for Ireland, eventually increasing the record to 93 goals by the end of his career with the national team; his record was not broken until 2018.