Sir William Henry Cowan (22 May 1862 – 11 January 1932) was a politician in the United Kingdom.

He was elected as Liberal Member of Parliament (MP) for Guildford from 1906 to 1910 and for Aberdeenshire Eastern from 1910 to 1922, then as a Unionist for Islington North from 1923 to 1929.

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