Königswinter (Kölsch: Köningkswinte; Low Franconian: Keuningswintjer) is a town and summer resort in the Rhein-Sieg district, in North Rhine-Westphalia, Germany.

It covers an area of 76.19 square kilometres which makes it the fourth-largest conurbation in the Rhein-Sieg district.

It contains over 80 townships and boroughs, divided over the municipal districts of Stieldorf, Niederdollendorf, Oberdollendorf, Heisterbacherrott, Ittenbach, Oberpleis, Eudenbach, Thomasberg and Königswinter proper.

The Drachenfels, crowned by the ruins of a castle built in the early 12th century by the archbishop of Cologne, rises behind the town.

From the summit, which can be accessed by the Drachenfels Railway, there is a view celebrated by Lord Byron in Childe Harold's Pilgrimage.