Primorsko (Bulgarian: Приморско) is a town and seaside resort in southeastern Bulgaria, part of Burgas Province. A well-known resort on the Bulgarian Black Sea Coast, it is located on a gore 52 km south of Burgas and has a beach strip of about 1 km². The average temperature is 27°C in July, often reaching 30-33°C and making Primorsko a favourable place for tourism. The rivers Ropotamo and Dyavolska reka run close to the town, and the Snake Island reserve is also nearby.

Remains of stone anchors from the second half of the 2nd millennium and the 1st millennium BC have been discovered in the waters around Primorsko, which can possibly be linked to Neolithic navigation. Remains of lead anchors from the 4th-5th century BC have also been found, as well as traces of Copper Age pottery and stone tools. Valchanovo kale, the ruins of a nearby medieval fortress, which inhabited from the Early Iron Age to the Late Middle Ages, are often linked with the fortress of Ranouli mentioned in the Hambarli inscription of Krum of Bulgaria. Medieval amphoras and pottery have been found in the mouth of the Ropotamo, and the ancient waystation and fortress of Gera is thought to have been located on Maslen nos.