William Ritchie may refer to:
- William Ritchie (barrister) (1817–1862), Advocate-General of Bengal
- William Ritchie (editor) (1781–1831), editor of The Scotsman
- William Ritchie (footballer) (1895–?), Scottish footballer
- William Ritchie (moderator) (1758–1830), Moderator of the General Assembly of the Church of Scotland
- William Ritchie (physicist) (1790–1837), physicist
- William E. Ritchie (died 1943), trick bicyclist
- William Gordon Ritchie (1918–1998), Manitoba politician
- Sir William Johnstone Ritchie (1813–1892), Chief Justice of Canada
- William Thomas Ritchie (1873–1945), Scottish cardiologist
- Bill Ritchie (1931–2010), cartoonist
- Bill Ritchie (politician) (1927–2014), Canadian politician
- Billy Ritchie (1936–2016), footballer
- Billy Ritchie (musician) (born 1944), British keyboard player and composer
- Willie Ritchie (golfer) (1884–1966), Scottish golfer
See also
- Willie Ritchie (1891–1975), boxer
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