Roman general during the Jugurthine War (111–105) and leader of the powerful Caecilius Metellus family, whose power had been established in the previous generation by his father, Metellus Calvus, and Calvus's brother, Quintus Metellus Macedonicus (Metellus Macedonicus, Quintus Caecilius).

As one of the two consuls (chief magistrates) in 109 BC, Metellus defeated the Numidian leader, Jugurtha, twice; he successfully stormed several towns but was less successful against Jugurtha's guerrilla tactics. His legate, Gaius Marius (Marius, Gaius), received permission to return to Rome to stand for the consulate. In 107 Marius was elected consul and was appointed to succeed Metellus. Although it was Marius and his legate (or emissary), Lucius Cornelius Sulla (Sulla, Lucius Cornelius), who finally captured Jugurtha, Metellus was granted a triumph in 106 and allowed to assume the triumphal name Numidicus, “conqueror of Numidia.” As censor (the magistrate responsible for the census and for public morality) in 102, Metellus unsuccessfully attempted to remove the reformers Lucius Appuleius Saturninus (Saturninus, Lucius Appuleius) and Gaius Servilius Glaucia from the Senate, and in 100 Metellus went into exile to escape having to swear support for Saturninus's agrarian law. He returned to Rome in 99, the year after Saturninus was killed, but thenceforth took no part in politics.