William Ritchie
William Ritchie may refer to:
- William Ritchie (barrister), Advocate-General of Bengal
- William Ritchie (editor), editor of The Scotsman
- William Ritchie (footballer), Scottish footballer
- William Ritchie (moderator), Moderator of the General Assembly of the Church of Scotland
- William Ritchie (physicist), physicist
- William E. Ritchie, trick bicyclist
- William Gordon Ritchie, Manitoba politician
- Sir William Johnstone Ritchie, Chief Justice of Canada
- William Thomas Ritchie, Scottish cardiologist
- Bill Ritchie, cartoonist
- Bill Ritchie (politician), Canadian politician
- Billy Ritchie, footballer
- Billy Ritchie (musician), British keyboard player and composer
- Willie Ritchie (golfer), Scottish golfer