Sir William Purdie Treloar, 1st Baronet (1843–1923) was the Lord Mayor of London.
He was born in London, and educated at King's College School. He was head of the firm of Treloar and Sons (haberdashery), and Director and Trustee of T. Cook and Son. He was selected Alderman of the City of London for the Ward of Farringdon Without from 1892, a Sheriff of the City of London in 1899 and Lord Mayor of the City of London in 1906/07.
On St Thomas's Day, 21 December 1881, he became a Common Councilman for the Ward of Farringdon Without. He served as a Common Councilman until he became its Alderman in 1892. As Alderman of the Ward it is said that one represents the World, the Flesh and the Devil i.e., Fleet Street, the home of the newspaper press; the Central Meat Market; and the Temple. He was the author of A Lord Mayor's Diary 1906-7 (1920) and of Wilkes and the City (London: John Murray, 1917).
Sir William Treloar established a 'Cripples' Fund' as his mayoral appeal, for which he gained 10,000 pounds of donations for his Alton Hospital during his tenure as Lord Mayor of London 9 November 1906 to 1907. Sir William and Lady Treloar greeted their first patients at the railway station of Alton on 8 September 1908 and a new branch was opened at Sandy Point, Hayling Island, in September 1919, with 50 patients.
As a result of this in 1908 he opened Treloar College and Treloar School, near Alton, Hampshire, which has become part of the Treloar Trust a charity supporting the UK’s leading specialist centre providing education, independence training and opportunities for young people with physical disabilities.
Treloar maintains its links with The City and Livery Companies: each Lord Mayor of the City of London automatically becomes a trustee of Treloar Trust and visits the college and school.