Theo Crosby RA (3 April 1925 – 12 September 1994) was an architect, editor, writer and sculptor, engaged with major developments in design across four decades. He was also an early vocal critic of modern urbanism. He is best remembered as a founding partner of the international design partnership Pentagram, and as architect for the reconstruction of Shakespeare's Globe in London. However, his role as éminence grise in British architecture and design from 1950 to 1990 helped effect much broader changes. Crosby's archive is located at the University of Brighton Design Archives.