Ariarathes V Eusebes Philopator (c.163-131/130): king of Cappadocia.
- Born as Mithradates
- Son of Ariarathes IV Eusebes and Antiochis (daughter of Antiochus III the Great and Laodice III)
- Married to: Nysa
- Son: Ariarathes VI Epiphanes
- Successor of: Ariathes IV Eusebes
- Student of the philosopher Carneades
- 163: Succeeds Ariathes IV Eusebes
- The Armenian king Artaxias I proposes a division of Sophene (along the Upper Euphrates), but Ariarathes puts a puppet king named Mithrobuzanes on the throne
- King Ptolemy of Comagene tries to conquer the Cappadocian city Melitene, but is repelled
- The Seleucid king Demetrius I Soter proposes that Ariarathes marries to his sister Laodice V, widow of Perseus of Macedonia; Ariarathes refuses
- 158: Civil war in Cappadocia; Demetrius supports Ariarathes' brother Orophernes II against Ariarathes V Philopator
- c.156: Ariarathes' sister Stratonice IV is married to king Attalus II Philadelphus, who brings back Ariarathes to his kingdom.
- Summer 152: Ariarathes and Attalus, the Egyptian king Ptolemy VI Philometor, and Rome, support Alexander I Balas, usurper in the Seleucid Empire.
- 133: Pergamon bequeathed to Rome; revolt of a Pergamene prince, Aristonicus
- 131/130: Ariarathes fights against Aristonicus and is killed in action
Succeeded by: Ariarathes VI Epiphanes