The Suessiones are a Belgic tribe of Western Belgium in the 1st century BC, inhabiting the region between the Oise and the Marne, based around the present-day city of Soissons.

They are conquered in 57 BCE by Julius Caesar.They may have been known to the Romans as Suaeuconi.

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