The Catacombs of Marcellinus and Peter are ancient catacombs situated on the 3rd mile of the ancient Via Labicana, today Via Casilina in Rome, Italy, near the church of Santi Marcellino e Pietro ad Duas Lauros. Their name refers to the Christian martyrs Marcellinus and Peter who, according to tradition, were buried here, near the body of St. Tiburtius.