Alexander Geoffrey Floyd OAM is an Australian botanist with an expert knowledge of rainforest plants, particularly the rainforest trees of New South Wales. He has worked with the New South Wales Forestry Commission, the Department of Forestry in Papua-New Guinea, and the National Parks and Wildlife Service of New South Wales. He helped create the North Coast Regional Botanic Garden at Coffs Harbour. Two genera and several species of plants are named in his honour; including Floydia, Alexfloydia, and Endiandra floydii.