Born in London, the son of Edward Speed, an architect, he studied architecture at the Royal College of Art, but soon took up painting, and continued his studies at the Royal Academy Schools between 1891 and 1896, winning a gold medal and a travelling scholarship in 1893. In 1896, he was elected as a member of the Royal Society of Portrait Painters.
Speed lived in Watlington, Oxfordshire and London, where he died on 20 March 1957.
Because of their intelligent combination of useful advice and sensitive reflection on the nature and meaning of artistic practice, Harold Speed's instructional manuals on drawing and painting have long been considered valuable resources for artists. There are editions of his manual "The Practice and Science of Drawing" (1913) in the public domain.
- "Biography". ArtMagick. Retrieved 2009-02-11.
- Waters, Grant M. (1975). Dictionary of British Artists Working 1900-1950. Eastbourne Fine Art. ISBN 0-902010-05-0.
- Speed, Harold (1913). The Practice and Science of Drawing. London: Seeley, Service & Co.