Square Louis-XVI, Urban park in 8th arrondissement of Paris, France.

Square Louis-XVI is an urban green space in Paris's 8th arrondissement situated between two major streets, offering pathways and planted areas for walking. At its center stands a chapel building surrounded by tall walls that define and enclose the space.

The site was originally a cemetery where many people were buried during the French Revolution. Later a chapel was constructed to transform the place and serve as a memorial to those events.

The square is the only public space in Paris named after Louis XVI; a nearby stretch of the Place de la Concorde bore the name Place Louis XVI from 1824 to 1830. A plaque at the entrance lists notable people buried in the former Madeleine cemetery, among them Charlotte Corday, Madame Roland, the Comtesse du Barry and the royal couple.

The square is easily reached from street level and has clear pathways for walking through. Visitors should know that the chapel interior is only open at certain times during the week.

The lawyer Pierre-Louis Olivier Desclozeaux, who lived at 48 rue d'Anjou, watched the royal burials and marked Louis XVI's grave with two weeping willows and a cypress. After his death in 1816, Louis XVIII bought the former cemetery and had the Chapelle expiatoire built over that spot, consecrated in 1826.