Stevenson is an unincorporated community located in the Green Spring Valley in Baltimore County, Maryland, United States. From 1830 until 1955, this community was served by the Green Spring Valley Branch of the old Northern Central Railway. Primarily a residential area, it is the site of the main campus of Stevenson University, which also has a campus in Owings Mills. It is also home to St. Timothy's School, an all-girls boarding and day high school.