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John Robert Cozens (1752 – 14 December 1797) was a British draftsman and painter of romantic watercolour landscapes.

Cozens executed watercolors in curious atmospheric effects and illusions which had an influence on Thomas Girtin and J. M. W. Turner. His poetic work included Alpine views and a sense of vastness. John Constable described Cozens as "the greatest genius that ever touched landscape."

In June 2010 Cozen's Lake Albano (c.1777) sold at auction, at Sotheby's in London, for £2.4 million, a record for any 18th-century British watercolour.