William Welsh
William Welsh may refer to:
- William Welsh (RAF officer), British Royal Air Force officer
- Willie Welsh, Scottish rugby player
- William Welsh (actor), American actor
- William Welsh (Canadian politician), merchant, ship owner and politician in Prince Edward Island
- William Welsh (footballer), footballer for Grimsby Town
- William P. Welsh, American muralist, portrait painter, and illustrator
- William Halliday Welsh, Scottish rugby union player
- Bill Welsh, American television announcer
- Bill Welsh (footballer, born 1908), Australian rules footballer for Geelong
- Bill Welsh (footballer, born 1924), Australian rules footballer for Collingwood
- William Welsh, brother of John Welsh