Dr William Brewer (c.1825 - 3 November 1881) was a surgeon and politician.
The son of J S Brewer of Eaton, Norfolk, he was educated in Scotland, gaining his medical degree at the University of St Andrews, and was Licentiate of the Royal College of Surgeons of Edinburgh. In 1872 he was elected a fellow of the Royal College of Physicians in London.
Active in the Liberal Party, Brewer sought election to the House of Commons in February 1867 at Colchester. He failed to be elected.
In June 1867 he was elected to the new Metropolitan Asylums Board as one of the representatives for the vestry of St George Hanover Square, and at the first meeting of the board was appointed chairman. He held the office until his death.
At the 1868 general election he again contested Colchester for the Liberals, and was returned as one of the town's two members of parliament, sitting until 1874.
A member of the Metropolitan Board of Works for St George Hanover Square Vestry 1870*3 and 1878-81
He died suddenly in 1881, aged 56.