Roskilde Amt (English Roskilde County) is a county (Danish, amt) on the island of Zealand (Sjælland) in eastern Denmark.

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 50 km west of Copenhagen. Danish kings were traditionally crowned there, in the Roskilde Cathedral. Roskilde is also home to the Viking Ships Museum, an "alternative" university, and the popular Roskilde Festival, annual music festival.

Municipalities:Bramsnæs ;Greve ;Gundsø ;Hvalsø ;Køge ;Lejre ;Ramsø ;Roskilde ;

Skovbo ;Solrød ;Vallø.