Quintus Lutatius Catulus (149-87 BC) was consul of the Roman Republic in 102 BC, and the leading public figure of the gens Lutatia of the time. His colleague in the consulship was Gaius Marius, but the two feuded and Catulus sided with Sulla in the civil war of 88–87 BC. When the Marians regained control of Rome in 87, Catulus committed suicide rather than face prosecution.
Based on the attested filation of his son Quintus Lutatius Catulus, his father was also named Quintus Lutatius Catulus. Although the name of his grandfather is not recorded, E. Badian is certain that Catulus was descended from Gaius Lutatius Catulus, the consul of 242 BC.
In the war against the Cimbri and Teutones, Catulus was sent to defend the passage of the Alps but found himself compelled to retreat across the Po River, his troops having been reduced to a state of panic. But the Cimbri were defeated on the Raudine plain, near Vercellae, by the united armies of Catulus and Marius. Despite their joint success, the two commanders regarded each other as bitter rivals and after the war built competing temples to demonstrate divine favor.
When the chief honour for victory over the Cimbri was given to Marius, Catulus turned vehemently against his former co-commander and sided with Sulla to expel Marius, Cornelius Cinna, and their supporters from Rome. When Cinna and Marius regained control of the city in 87, Catulus was prosecuted by Marius's nephew, Marcus Marius Gratidianus. Rather than accept the inevitable guilty verdict, he committed suicide.