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.