Collo (Arabic: القل, romanized: al-Qull), known as Chullu in antiquity, is a port town in the Skikda Province in northeastern Algeria, and forms part of the Collo Massif region. It is the capital and one of three municipalities of the Collo District.
Formerly a Phoenician trading post, then a Numidian and Roman port, Collo became under the Hammadids the port of Constantine. Today it is a small seaside town of about 35,000 inhabitants in 2008.