Gallus Quintus Bonosus was a Roman usurper. Born in Spain, his father was a Briton and his mother came from Gaul. He lost his father early in life but his mother gave him a decent education. He had a distinguished military career and an excellent service record when, stationed on the Rhine, the Germans managed to burn and destroy the Roman fleet under his command.

Fearful of the consequence he proclaimed himself Roman emperor (ca. 281). However, it did not save him from Probus, who after a lengthy and protracted struggle, managed to defeat him. Bonosus saw no way out and hanged himself.

He left behind a wife and 2 sons who were treated with honour by Probus.