Soissons is a commune in the northern French department of Aisne, in the region of Hauts-de-France. Located on the river Aisne, about 100 kilometres (62 mi) northeast of Paris, it is one of the most ancient towns of France, and is probably the ancient capital of the Suessiones. Soissons is also the see of an ancient Roman Catholic diocese, whose establishment dates from about 300, and it was the location of a number of church synods called "Council of Soissons".

Aisne is a French department in the Hauts-de-France region of northern France. It is named after the river Aisne. In 2020, it had a population of 529,374.