William Mullins may refer to: William Mullins (Mayflower passenger) William Mullins, 2nd Baron Ventry (1761–1827), Anglo-Irish politician and peer William D. Mullins (1931–1986), American politician and baseball player William W. Mullins (1927–2001), American physicist and materials scientist Willie Mullins (born 1956), Irish racehorse trainer and jockey Bill Mullins (born 1948), Australian rugby league player Bill Mullins (equestrian) (1920–2015), Irish equestrian