The Pharnacid Dynasty was a local dynasty that ruled the satrapy of Hellespontine Phrygia under the Achaemenid Dynasty of Persia from the 5th until the 4th century BCE. It was founded by Artabazus, son of satrap Pharnaces (younger brother of Hystaspes, who was born shortly before 565 BCE), son of Arsames (died ca. 520 BCE). The last member of the dynasty was Pharnabazus III.
The residence of the Pharnacid Dynasty was at Dascylium (near modern day Ergili, Turkey).