William Fitzpatrick may refer to:
William H. Fitzpatrick (1865–1932), American Democratic Party official William John Fitzpatrick (1830–1895), Irish historian William P. Fitzpatrick (born 1961), Irish-American politician William of Salisbury, 2nd Earl of Salisbury (died 1196), sometimes referred to as William fitz Patrick
See also Fitzpatrick (surname) Fitzpatrick (disambiguation)