Mănăstirea Cașin is a commune in Bacău County, Western Moldavia, Romania.

It is composed of four villages: Lupești, Mănăstirea Cașin, Pârvulești, and Scutaru.

The commune is situated in the Tazlău–Cașin Depression [ro] of the Moldavian Subcarpathians, on the banks of the river Cașin.

Mănăstirea Cașin is crossed by county road DJ115, which leads to the city of Onești, 16 kilometres (10 mi) to the north.

This Bacău County location article is a stub.