Locust Grove Institute (LGI), now Locust Grove Memorial Complex, is a former college preparatory school in Locust Grove, Henry County, Georgia, United States, that is listed on the National Register of Historic Places (NRHP).

The school was founded by the Locust Grove Baptist Church and Mercer University and opened in 1894.

Operations and ownership changed with the onset of war, depression and competition from public schools.

[2][3][4] The school's Academic Building was added to the National Register of Historic Places on September 4, 1986.

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