William Mounsey may refer to:
- William Mounsey (Royal Navy officer) (1766–1830), British officer of the Royal Navy
- William Mounsey (bishop) (1867–1952), Bishop of Labuan and Sarawak, 1909–1916
- William H. Mounsey (1808–1877), British soldier and antiquarian
This disambiguation page lists articles about people with the same name.
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