The Suessiones (or perhaps Suessones) were a Belgic people of north-eastern Gaul in the 1st century BC, inhabiting the region between the Oise and the Marne, based around the present-day city of Soissons. They were conquered in 57 BC by Julius Caesar.

Caesar recounts in his Gallic Wars that in 57 BC the Suessiones were ruled by Galba, and that in living memory of that time their king Divitiacus (or Diviciacus) had exercised sovereignty over most of the Belgae and even parts of Britain.

The town mentioned by Caesar as their capital, Noviodunum ("New Town"), is probably the modern Soissons.

See also

• List of peoples of Gaul
• List of Celtic tribes