William Fitzsimmons

William Fitzsimmons may refer to:

• William Fitzsimmons (Canadian politician) (1818–1894)
• William Fitzsimmons (Northern Ireland politician) (1909–1992), in Northern Ireland
• William Fitzsimmons (musician) (born 1978), American singer-songwriter

See also

• William FitzSimons (1870–1926), Irish-born Australian politician
• William T. Fitzsimons (1889–1917), a U.S. Army officer