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William Donaldson Cruddas (1831 – 8 February 1912) was a British business director and politician. He married the daughter of William Nesham who was the honorary secretary to the Cathedral Nurse and Loan Society.^[1] From 1888 they owned and lived at Haughton Castle.

Born in Elswick, Cruddas became a director of the Elswick Works, and chairman of the Newcastle and Gateshead Water Company. He also became a justice of the peace. At the 1895 UK general election, he was elected for the Conservative Party in Newcastle-upon-Tyne,but he retired in 1900 after a long period of ill health and the death of his wife who had been nursing him.^[1] In 1903, he was appointed as High Sheriff of Northumberland.^[2]