Clarence Bicknell (1842-17 July 1918) was a British amateur botanist and archaeologist. While employed as a vicar in Bordighera, Italy, Bicknell became noted for his identification of the plants and petroglyphs of the Ligurian Riviera. Bicknell's notable writings include Flowering Plants of the Riviera and Neighboring Mountains (1885) and Guide to the Prehistoric Rock Engravings of the Italian Maritime Alps (1913). His extensive collection of specimens and illustrations were archived in the Museo Biblioteca Clarence Bicknell in Bordighera and at the University of Genoa. He was a supporter of Esperanto, and wrote and translated poems in that language. In 1912, he was awarded the Natural Flower at the Internaciaj Floraj Ludoj.