Seine-Saint-Denis is a French department located in the Île-de-France region and in the Grand Paris. Locally, it is often referred to colloquially as quatre-vingt treize or neuf trois (i.e., "ninety-three" or "nine three"), after its official administrative number, 93.

The learned and rarely used demonym for the inhabitants is Séquano-Dionysiens; more common is Dionysiens.

Seine-Saint-Denis was created in January 1968, through the implementation of a law passed in July 1964. It was formed from the part of the (hitherto larger) Seine department to the north and north-east of the Paris ring road (and the line of the old city walls), together with a small slice taken from Seine-et-Oise.

Seine-Saint-Denis has a history as a veritable left-wing stronghold, belonging to the ceinture rouge (red belt) of Paris. The French Communist Party especially has maintained a continued strong presence in the department, and still controls the city councils in cities such as Saint-Denis, Montreuil and La Courneuve. Until 2008, Seine-Saint-Denis and Val-de-Marne were the only departments where the Communist Party had a majority in the general councils but the 2008 cantonal elections saw the socialists become the strongest group at the Seine-Saint-Denis general council (while the Communist Party gained a majority in Allier and lost it in 2015).

A commune of Seine-Saint-Denis, Clichy-sous-Bois, was the scene of the death of two youths which sparked the nationwide riots of autumn 2005. In October and November, 9,000 cars were burned and 3,000 rioters were arrested.

In 2018, the department had the highest crime rate in metropolitan France. In 2017, the area was the theatre of 18% of all drug offences in metropolitan France.

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