Gannicus or Cannicus was a Gallic slave, who together with the Thracian Spartacus, and the fellow Gauls Crixus, Oenomaus and Castus, became one of the leaders of rebel slaves during the Third Servile War (73-71 BC). In the winter of 71 BC, Gannicus, along with Castus, broke off from Spartacus, taking a large number of Celts and Germans with them, marking the second detachment of the rebellion. Gannicus and Castus met their end in Lucania near Mount Soprano (Mount Camalatrum), where Marcus Licinius Crassus, Lucius Pomptinus and Quintus Marcius Rufus entrenched their forces in battle and defeated them.