William Mounsey may refer to:
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William Mounsey (Royal Navy officer)
William Mounsey CB (1766 – 25 September 1830) was a British officer of the Royal Navy. He served during the American Revolutionary, the French Revolutionary and the Napoleonic Wars, rising to the rank of Captain.
Family and early life
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(1766–1830), British officer of the Royal Navy
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William Mounsey (bishop) (1867–1952), Bishop of Labuan and Sarawak, 1909–1916
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William H. Mounsey (1808–1877), British soldier and antiquarian
{{hndis, Mounsey, William