William the Rich may refer to:
- William I, Count of Nassau-Siegen (1487–1559)
- William, Duke of Jülich-Cleves-Berg (1516–1592)
- William Jennens (1701–1798) William the Miser, William the Rich, 'the richest commoner in England' who died intestate. The legal case dragged on for over 100 years.
This disambiguation page lists articles about people with the same name.
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