Roger David Spencer (born 6 October 1945) is a British-Australian horticultural botanist who was born at Alfreton, Derbyshire. He has an honours degree in botany from the University College of Wales, Aberystwyth, a master's degree and doctorate from the University of Melbourne (in phycology) and a technical certificate in gardening and turf maintenance from Oakleigh Technical College, Melbourne. He is currently horticultural botanist at the Royal Botanic Gardens Melbourne where he works in the Plant Identification Service, contributing locally and internationally to the study of cultivated plant taxonomy.
