Pharnaces is the name of two kings of Pontus:

Pharnaces I of Pontus, first important ruler of the kingdom

Pharnaces II of Pontus, famous for having made an unfortunate attempt to reconquer Pontus, crushed by Julius Caesar. He was the son of the famous Mithridates VI of Pontus.

Pharnaces is also the name of the founder of the Pharnacid Dynasty of satraps of Phrygia on the Hellespont under the Achaemenid dynasty of Persia, and of one of his descendants (see Artabazus).