Marcus Manlius Vulso was a consular tribune of the Roman Republic in 420 BC. Manlius belonged to the Manlia gens, an ancient and influential patrician family. Manlius was the son of a Gnaeus Manlius Vulso, who should probably be identified with the consul of 474 BC or an otherwise unattested son of the consul. If the consul is his father then Aulus Manlius Vulso, the decemviri of 451 BC, would have been his brother. Filiations indicate that , consular tribune in 400 BC, was the son of Manlius.