John Morrissey (1831–1878) was an American boxer and politician.
John Morrissey may also refer to:
John Morrissey (baseball) (1856–1884), Major League Baseball player John Morrissey (footballer) (born 1965), English footballer John Morrissey (rugby union) (1939–2013), New Zealand rugby union player John P. Morrissey (politician) (1885–1966), New York politician John P. Morrissey (biologist), Irish biologist Johnny Morrissey (born 1940), English footballer John Morrissey (Australian politician), Victorian state MP from 1897 to 1907