Harry Osborn [also known as H. Osborn] was born in Chichester, Sussex, England in c.1886 and was the son of William Henry Osborn (1854-?), a master builder and decorator. In the 1911 England census his occupation is given as Architect and Building Surveyor. Nothing is known about his training as an architect. It may have been with his father.
His address is given as 45 North Street, Chichester, Sussex in 1911 and 1923. He is known to have been active as an architect until at least 1939.
Harry Osborn is not listed in the RIBA Directory of British Architects 1834-1914, or in any of the three volumes of Who's Who in Architecture (1914, 1923, 1926). It is assumed, therefore, that he did not formally qualify as an architect.
A seaside bungalow designed by Osborn is discussed in Modern Cottages and Villas. A Series of Designs for Small Houses Costing from £150 to £1000 by Hugh B. Philpott (London: John Dicks Press, 1908 p.100). The Tudor House, a Tudor-style house designed for himself in Chichester, Sussex, and another house in Chichester Osborn designed for a Dr. and Mrs. Templeton are discussed in The House Desirable. A Handbook for Those Who Wish to Acquire Homes that Charm. by P. A. Barron (London: Methuen & Co., 1929 pp. 153-158, 236-238). Osborn designed other houses in Chichester, Worthing and Aldwick, Sussex; and Dorking, Surrey. He also designed Kimbell's Restaurant in North Street, Chichester; The Ship Hotel in North Street, Chichester; and offices of the Inland Revenue at No. 8 North Pallant, Chichester
Barron, P.A. The House Desirable. A Handbook for Those Who Wish to Acquire Homes that Charm. London: Methuen & Co., 1929
Templeton, John. ‘Harry Osborn, a Chichester architect’. Chichester History no. 7, 1990 pp. 25-26