William Halliday

William Halliday may refer to:

• William Halliday (politician) (1828–1892), Australian politician
• William Reginald Halliday (1886–1966), English historian
• William P. Halliday (1827–1899), American steamboat captain, banker and businessman

See also

• William Haliday (1788–1812), Irish language scholar
• William Holliday (disambiguation)