Baron R. De Selys-Fanson (or De Selys de Fanson), Belgian diplomat, came to the Transvaal in 1876, where he appears to have acted as Belgian consul. In 1879 he was appointed Belgian consul in the Cape Colony. He and a party from the Musée royal d'histoire naturelle de Bruxelles, Belgium, collected orthopterous insects in the Transvaal and Cape Colony. A list of these insects was presented by Auguste de Bormans to the Societé entomologique de Belgique in December 1880, and published in its Annales (Vol. 25).
He was probably Baron Robert de Selys de Fanson (or de Selys-Fanson), 1838-1887, also consul-general at Singapore.