Denys Ovenden (1 April 1922 – 26 November 2019) was a British natural history illustrator. His preoccupation with drawing began very early, since there are drawings on the fly-leaves of books from that period. His natural history interest began. Watercolour was the basic medium for his work, with occasional gouache for highlighting or detail. His preferred working surface was a fashion type board, CS2 not surface being the favourite. Ovenden died in November 2019 at the age of 97.