Walnut Grove was a small town (now extinct) in Prairie Township, Warren County, Indiana, located three miles east of Tab.

A 1913 history describes the town's population as about 50.

A post office was once established at Walnut Grove in 1872, and remained in operation until it was discontinued in 1900.

[1] Walnut Grove is located in flat, open farmland at the intersection of County Roads 650 North and 500 West.

This Warren County, Indiana location article is a stub.