John Cullen is an ice hockey player. John Cullen may also refer to: * John Cullen (baseball) (1854–1921), Major League Baseball player * John Cullen (chemical engineer) (1926–2018), head of the UK Health and Safety Commission * John Cullen (field hockey) (born 1937), New Zealand competitor in field hockey at the 1964 Summer Olympics * John Cullen (police officer) (1850–1939), New Zealand police officer and commissioner * John Cullen (rugby union) (born 1990), American rugby union player * John Hugh Cullen (1883–1970), Irish-born Catholic priest, writer and historian in Australia * John J. Cullen (1845–1896), New York politician * John Michael Cullen (1927–2001), ornithologist * Sir John Cullen, 2nd Baronet (1652–1677), of the Cullen baronets