Oberlin Township is a township in Decatur County, Kansas, United States.

As of the 2000 census, its population was 91.

Oberlin Township covers an area of 34.26 square miles (88.7 km2) and contains one incorporated settlement, Oberlin (the county seat).

The streams of North Fork Sappa Creek and South Fork Sappa Creek run through this township.

This article about a location in Decatur County, Kansas is a stub.