Vologases, also seen as Vologaeses, Vologaesus, Vologeses, Ologases, Valarsh (Armenian), and Balash (modern Persian) was the name of six kings of Parthia:

Vologases I c. 51–78

Vologases II c. 77–80

Vologases III c. 105–147

Vologases IV c. 147–191

Vologases V c. 191–208

Vologases VI c. 208–228

A later Balash belonged to the Sassanid dynasty.