Derwent Lees (14 November 1884 – 24 March 1931) was an Australian landscape painter.
Born Desmond Lees in Hobart, Australia, Lees taught drawing at the Slade School of Fine Art in London, England, and was a member of the New English Art Club from 1911.
He was a friend of Augustus John and James Dickson Innes, and spent the period from late 1910 to 1912 with them at a cottage called Nant Ddu in north Wales. In 1912 Innes and Lees went on another painting trip to Collioure in France.
His artistic career was curtailed by a mental health problem which saw him confined to an asylum from 1918 until his death in 1931.