Locust Grove Institute (LGI), now Locust Grove Memorial Complex, is a former college preparatory school and (after closing for several years) was used as an elementary school. It was founded by the Locust Grove Baptist Church and Mercer University in Locust Grove, Henry County, Georgia and opened in 1894. The school building was constructed in 1904 for $14,000 and burned in 1906. Its operations and ownership changed with the onset of war, depression, and competition from public schools.