Howard Sydney Musgrave Coster (27 April 1885 – 17 November 1959) was a British photographer, opening a London studio in 1926.

[1] After a childhood in the Isle of Wight, he was introduced to photography through his uncle who owned a photographic studio where Coster worked before moving to South Africa to try his hand at farming.

After serving in the RAF during World War I he worked in a studio in South Africa where he met his future wife Joan Burr (1903–1974), who was also a photographer.

[1] In 1926, on his return from South Africa with his wife, Coster opened a studio at 8 and 9 Essex Street, off the Strand.

Carefully judged, low-key effects illuminate character and suggest atmosphere in studies such as those of the crime writer Edgar Wallace or the oboist Leon Goossens.