Roskilde Amt (English: Roskilde County) is a former county (Danish: amt) on the island of Zealand (Sjælland) in eastern Denmark. The county was abolished effective January 1, 2007, when it merged into Region Sjælland (i.e. Region Zealand).
Roskilde is also the name of the county's capital, and the name of a municipality (Danish: kommune). The small city of Roskilde is located 30 km west of Copenhagen. Danish kings were traditionally crowned there, in the Roskilde Cathedral. Roskilde is also home to the Viking Ship Museum, an "alternative" university, and the popular Roskilde Festival, annual music festival.