Lineboro Historic District is a national historic district at Lineboro, Carroll County, Maryland, United States. It comprises most of the village of Lineboro. In addition to a number of 19th and early 20th century homes, also present are agricultural outbuildings, including bank barns. Public, commercial, and industrial buildings include several stores, a one-room school and a fire hall. Other buildings of interest include the former hotel, a feed mill, and the 1908 cruciform-plan Gothic Revival Lazarus Union Church. The district comprises a total of 83 resources, of which 70, or 84%, contribute to its significance. It was added to the National Register of Historic Places in 1996.