William Marmion (1845–1896) was an Australian politician.
William Marmion may also refer to:
- William Marmion, Baron Marmion of Torrington (died 1265), English clergyman and member of Simon de Montfort's Parliament
- William Marmion (died 1274) (died 1274), son of Robert Marmion (died 1242)
- William Marmion (Norham Castle Knight), possibly the Leicestershire MP, see John Marmion, 4th Baron Marmion of Winteringham
- Sir William Marmion (Leics MP 1307), member of parliament for Leicestershire
- Sir William Marmion (Lincs MP 1357), member of parliament for Lincolnshire
- William Marmion (died 1529) (1461–1529), member of parliament for Gloucester
- William H. Marmion (1907–2002), bishop of the Episcopal Diocese of Southwestern Virginia
- Bill Marmion (born 1954), Australian member of the Legislative Assembly of Western Australia
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