Petrolia may refer to:
;United States
*
Petrolia, New York
*
Petrolia, California
Petrolia is an unincorporated community in Humboldt County, California, northeast of Cape Mendocino, at an elevation of above sea level, within ZIP Code 95558, and area code 707. Petrolia was the site of the first oil well drilled in Califor ...
* Petrolia, Kansas
* Petrolia, Pennsylvania
* Petrolia, Texas
** Petrolia Formation
;Canada
* Petrolia, Ontario
;Venezuela
* Petrolia del Tachira, first private oil company of Venezuela
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