Clarksville Historic District is a national historic district located at Clarksville, Pike County, Missouri. The district encompasses 65 contributing buildings in the central business district and surrounding residential sections of Clarksville. It developed between about 1840 and 1930, and includes representative examples of Greek Revival, Italianate, and Queen Anne style architecture. Located in the district is the separately listed Clifford-Wyrick House. Other notable buildings include the City Hall (1910), Sentinel Building (1867-1871), Clifford Banking Company (c. 1887), La Crosse Lumber Company (1923), Presbyterian Church, Methodist Church (1906), Masonic Temple (1903), and Clarksville Public Library (1910).