Thorntown Public Library is a historic Carnegie library located at Thorntown, Boone County, Indiana. It was built in 1914-1915, and is a one-story, three bay, brown brick building with a red clay tile hipped roof. It has a round arched entrance and limestone trim. Its construction was funded with $10,000 from the Carnegie Corporation of New York.It was listed on the National Register of Historic Places in 1986.