Wimperis, Simpson & Guthrie were a firm of architects based at 61, South Molton Street, London, W1, most active in the 1920s and 1930s. They were known for their design of buildings such as Fortnum and Mason on Piccadilly, the Cambridge Theatre, Marine Gate in Brighton and Winfield House.
The founding partners were Edmund Wimperis, William Begg Simpson & Leonard Rome Guthrie, who joined the Wimperis & Simpson partnership in 1925.