Piar Municipality is a municipality in Monagas State, Venezuela. In the north it borders Caripe Municipality.
On 2021, Mariangellys Tillero was elected Major.
Minimum monthly temperature in the Piar municipality lies between 14.3 and 23.1 ðC, while maximum temperature is between 23.9 and 33.3 ðC. Total annual precipitation fluctuates between 1083 and 1898 mm. Most rain falls between June and August, while the driest quarter comprises February to April.