Ana MarÃa Crespo de las Casas (born 30 March 1948, Santa Cruz de Tenerife) is a Spanish lichenologist noted for studying the phytosociology, taxonomy and floristics of Mediterranean lichens.
She was awarded the 2012 Acharius Medal from the International Association for Lichenology for lifetime achievements in lichenology, and the genera Cresponea and Cresporaphis were named in her honor.
The standard author abbreviation A.Crespo is used to indicate this person as the author when citing a botanical name.