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The authors present an update of the World List of Cycads. This is a list of the valid names of all extant cycads, together with details of their countries of occurrence, the primary publication references, herbarium localities for the types, and details of their conservation status. A list of synonyms is also provided for each genus. The number of species on the current list is as follows: Bowenia (2) Ceratozamia (27), Cycas (107), Dioon (14), Encephalartos (65), Lepidozamia (2), Macrozamia (41), Microcycas (1), Stangeria (1), and Zamia (71), giving a total of 331 species.