William Allan
William Allan may refer to:
Politicians
- George William Allan, Canadian politician
- George William Allan (Manitoba politician), Canadian politician
- William Allan (banker), Canadian banker, businessman and politician
- William Allan (English politician), Liberal Party politician in the United Kingdom
- William Allan (Queensland politician), pastoralist and politician in Queensland, Australia
Sportspeople
- William Allan (footballer, born 1880), Scottish goalkeeper for Falkirk, Rangers and Hibernian
- William Allan (footballer, born 1904), Scottish defender for Hamilton and Motherwell
- Willie Allan, Scottish footballer
- Wee Willie Allan, American dirt modified racing driver
Others
- William Allan (British Army officer)
- William Allan (classicist), Scottish classicist
- William Allan (geneticist), American physician and geneticist
- William Allan (painter), Scottish historical painter
- William Allan (trade unionist), British trade unionist
- William Evan Allan, Australian military figure, seeing service in WWI and WWII
- William Allan of Glen, Lord Provost of Edinburgh