John Clayton Adams or J. Clayton Adams (1840 – 20 June 1906) was an English landscape artist. Adams was born the second son of Mr. C.H. Adams in Edmonton, Middlesex (now in Greater London), and studied art at the Bloomsbury School and later under William Wilthieu Fenn. He first exhibited at the Royal Academy, London, when he was 19, and, throughout the period 1863 to 1893, exhibited 75 pictures there, and 25 at the Royal Society of British Artists. In 1873 Adams moved to "Brackenhurst", Ewhurst Hill, near Guildford. Most of his landscapes depict scenes from counties in southern England, particularly Surrey. However, he also painted a few Scottish works featuring the River Tweed.