Publius Caecina Eustacius (260 BC-) was a Roman soldier who served as a hastatus in the Roman Army during the Second Punic War. He served in Publius Cornelius Scipio's Legio II Veneria, raised in Umbria et Picenum, and fought against the Gauls of Liguria, including at the Battle of Cantalupum in 218 BC.