Koprinka (Bulgarian: Копринка) is a reservoir and dam in the Rose Valley, central Bulgaria.

It was built on the Tundzha river at 7 km to the west of the city of Kazanlak near the village of Koprinka.

During the construction of the dam was discovered the ancient Thracian city Seuthopolis which was the capital of the Odrysian kingdom.

In 2005, the Bulgarian architect Zheko Tilev proposed a project to uncover, preserve and reconstruct the city of Seuthopolis which is the best preserved Thracian city in Bulgaria by means of a dam wall surrounding the ruins in the middle of the dam, enabling the site's inscription as a UNESCO World Heritage Site and making it a tourist destination of world importance.

[1] Many citizens of Kazanlak spend their leisure time around the reservoir which offers good conditions for water sports.