Ulcinj (Montenegrin: Ulcinj/Улцињ, pronounced [ǔlt͡siɲ]; Albanian: Ulqin or Ulqini; Italian: Dulcigno) is a coastal resort town and municipality in Montenegro. The town of Ulcinj has a population of 10,828 (2003 census) of which the majority are Albanians. Ulcinj is the centre of the municipality and the centre of the Albanian community in Montenegro.

The wider area of Ulcinj has been inhabited since the Bronze Age, based on dating of Illyrian tombs (tumuli) found in the village of Zogaj, in the vicinity of Ulcinj. The town is believed to have been founded in the 5th century BC by colonists from Colchis, as mentioned in the 3rd century BC poem by Apollonius of Rhodos.

Illyrians lived in the region at the time, and under Greek influence built immense so-called Cyclopean Walls. In 163 BC, the Romans captured Colchinium from the Illyrian tribe of Olciniates and renamed the town Olcinium (aka Ulcinium) after the tribe. Under Roman rule the town received the status of Opidum Civium Romanorum (Town with Special Privileges), only to be later granted Municipium (Independent Town) status. When the Roman Empire was split in two, Olcinium became a part of the Eastern Roman Empire (later known as the Byzantine Empire).