Ermanno Giglio-Tos (25 March 1865 – 18 August 1926) was an Italian entomologist.
Giglio-Tos was born at Chiaverano, Turin, and studied at the University of Turin from 1886 until 1896 under Michele Lessona.
Later he was a professor at the University of Cagliari.
He specialised in Diptera, Mantodea, Phasmatodea, Orthoptera and Blattodea.
His collections are in the Turin Museum of Natural History.