Mizil is a town in Prahova County, Muntenia, Romania. Located in the southeastern part of the county, it lies along the road between the cities of Ploiești and Buzău, and to the northeast of the national capital, Bucharest. Its position led it to become a thriving market town beginning in the 18th century, before a long period of economic decline began in the early 20th century. Agriculture gave way to industry as the chief employment under the Communist regime, but the town has continued to face difficulties in the wake of a late-1990s deindustrialisation.

Prahova County is a county (județ) of Romania, in the historical region Muntenia, with the capital city at Ploiești.