Marienthal is a census-designated place (CDP) in Wichita County, Kansas, United States.

[2] In 1892, the community was founded by a group of immigrant Volga Germans; they named it after their previous hometown of Marienthal (Tonkoschurovka), Russia (today Sovetskoya, Russia), located in the district of Saratov, on the east side of the Volga River.

[3] The USPS discontinued service to Marienthal in 2011; the post office was officially closed in 2017.

[4] Marienthal now consists of roughly 100 people, a Catholic church,[5] a flour mill,[6] a substance abuse treatment center, a trucking company, a bar and a grain elevator.

The 2020 United States census counted 64 people, 33 households, and 21 families in Marienthal.