Sac City Monument Square Historic District is a nationally recognized historic district located in Sac City, Iowa, United States. It was listed on the National Register of Historic Places in 2015. The square consists of the General Sherman Hall (1892), Memorial Statue (1894), the American Legion Hall (1922), four World War II era Howitzers, and three granite tablets that commemorate the lives of the soldiers from Sac County who fought in World War I, World War II, the Korean War, and the Vietnam War. The Vietnam War tablet does not contribute to the historic district because it is a more recent installation.