Catlett is a census-designated place in Fauquier County, Virginia, United States. The population as of the 2010 census was 297. It is located west of the Prince William County line. Catlett was a former rail stop on the Orange and Alexandria Railroad. The area was the site of many raids on the railroad during the American Civil War.The Catlett Historic District was listed on the National Register of Historic Places in 2008, and Auburn Battlefield in 2011.