William Mainwaring (1884–1971) was a Welsh miner, trade unionist and politician.
William Mainwaring may also refer to:
- William Mainwaring (English politician) (1735–1821), MP for Middlesex 1784–1802
- Billy Mainwaring (William Thomas Mainwaring), Welsh rugby union player
- William Massey-Mainwaring, Irish art collector and politician
- William Mainwaring, governor of Hudson's Bay Company (1807–1812)
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