Mănăstirea Cașin

{{For|the church in Bucharest|Cașin Church}}

{{Use dmy dates|date=January 2025}}

{{Infobox Romanian subdivision

|type = commune

|county = Bacău

|name = Mănăstirea Cașin

|image_flag =

|image_shield =

|image_skyline = Manastirea Casin21.jpg

|image_caption = Cașin Monastery

|image_location =

|image_map = Manastirea Casin jud Bacau.png

|leader_name = Adriana Enache

|leader_party = PNL

|leader_term = 2020–2024

|map_caption = Location in Bacău County

|coordinates = {{coord|46|9|N|26|41|E|region:RO|display=it}}

|elevation = 352

|elevation_min =

|elevation_max =

|area_total = 243.27

|population_as_of =

|population_total = auto

|population_footnotes =

|postal_code = 607310

|area_code =

|website = {{url|https://manastireacasin.ro}}

}}

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 {{ill|Tazlău–Cașin Depression|ro|Depresiunea Tazlău-Cașin}} of the Moldavian Subcarpathians, on the banks of the river Cașin. It is located at the southwestern extremity of the county, on the border with the Vrancea and Covasna counties. Mănăstirea Cașin is crossed by county road DJ115, which leads to the city of Onești, {{convert|16|km|sigfig=1}} to the north.

The {{ill|Old Cașin Monastery|lt=Cașin Monastery|ro|Fosta mănăstire Cașin}}, located in the Mănăstirea Cașin village, was founded in 1655 by Voivode Gheorghe Ștefan.