Locust Grove was a small town (now extinct) in Prairie Township, Warren County, Indiana, located three miles northeast of Tab. A 1913 history describes the town's population as "less than a hundred", but all that remains at the site is the Locust Grove Church, Locust Grove Cemetery and a few homes.
Locust Grove is located at 40°26'24" North, 87°26'5" West (40.440100, -87.434820), at the intersection of County Roads 850 N and 600 W. It sits in open farmland on a low, broad hill.