James Mangles FRS FRGS (1786 – 18 November 1867) was an officer of the Royal Navy, naturalist, horticulturalist and writer. He served during the French Revolutionary and Napoleonic Wars, rising to the rank of captain. In the post-war period, with his brothers Robert and George, who shared his interests in horticulture, botany and plant collection, James was actively involved in the botanical, horticultural and commercial life of early colonial Western Australia.