Gerald Callcott Horsley (31 October 1862, in Glasgow – 2 July 1917, in Crowborough, East Sussex)[1] was a British architect and draughtsman who lived in London.
In 1883, Horsley was a founder member of the St George's Art Society, 1884 of the Art-Workers' Guild.
He was the first recipient, in 1887 and again in 1888, of the Owen Jones Studentship of the Royal Institute of British Architects (RIBA) which took him twice to Italy.
A RIBA associate in 1890, he left the institute in 1892 in protest against plans for compulsory registration of architects; he rejoined as a fellow in 1906.
Horsley was also an excellent draughtsman and submitted views of historic monuments to the annual exhibitions of the Royal Academy all his life.