Gaius Mamilius Limetanus was Roman Republican politician who served as one of the plebeian tribunes for 109 BC. He established a court, the Mamilian commission, to prosecute those who abetted the Numidian king Jugurtha and had taken bribes from him. The court convicted five men and sent them into exile. He also may have passed a law regulating the use of agricultural land.
He also may have served as one of the (a ten man commission for the assignment and giving of agricultural land) in 91 BC for the implementation of Marcus Livius Drusus' agricultural laws.