Downtown Baton Rouge Historic District is a historic district in downtown Baton Rouge, Louisiana, United States, located along 3rd Street, from Main Street to North Boulevard. The district comprises a total of 43 commercial buildings ranging in dates from c.1860 to mid-1950s. Third street was downtown Baton Rouge main commercial avenue during historic period. Of the 32 contributing properties, six are also individually listed on the National Register of Historic Places.