The rue de Montmorency is a street in the historic Le Marais quarter of Paris, part of the city's 3rd arrondissement in the historical heart of the capital.

It runs from the rue du Temple to the rue Saint-Martin (at number 212).

Named in 1768 after the Montmorency family, prominent residents of Le Marais during the Renaissance period. The Montmorency family is one of the oldest and most distinguished families in France, derived from the city of Montmorency, now in the Val-d'Oise département, about 9 miles (15 km) northwest of Paris.

As the Montmorency was a noble family, the street lost its name at the French Revolution. Therefore, it was known between the end of the French Revolution and 1806 as the rue de la Réunion.