Abílio Fernandes (19 October 1906, Guarda, Portugal – 16 October 1994, Coimbra), was a Portuguese botanist and taxonomist from the Botanical Institute at the University of Coimbra who was married to Rosette Mercedes Saraiva Batarda (1916–2005), another Portuguese botanist and taxonomist.

[1] Fernandes is noted for his work on Amaryllidaceae, and compiling floras of Portugal, Macaronesia and Tropical Africa.

Fernandes was Quintanilha's student during the academic year 1926–27 and was invited to become teaching assistant in 1927.

He became interested in the number and form of chromosomes in different species, later specialising in cyto-systematics, founding and becoming head of a research programme on cytotaxonomy at the University of Coimbra, where he stayed for the remainder of his career.

Some of her work was published in Flora Zambesiaca and she did a taxonomic revision of the families Avicenniaceae, Verbenaceae and Lamiaceae.