Baltimore County Jail is a historic jail located at Towson in Baltimore County, Maryland, United States. It was built in 1855 and is a two-story Italianate style stone building, measuring 52 feet wide and 62 feet deep. It consists of a five-bay-wide warden’s house with a central three story entry tower. In the rear is a cell block with three levels of jail cells and covered by a gable roof. The warden's house and tower features a low pyramidal hipped roof and walls. Attached to the warden's house is a stone garage built in 1940. It was used as a correctional facility until 2006.
It was listed on the National Register of Historic Places on August 26, 2009.