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.
Born in Elswick, Cruddas became a director of the Elswick Works, and chairman of the Newcastle and Gateshead Water Company.
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.