Square Nadar, Urban park in Montmartre, Paris, France

Square Nadar is an urban park in the 18th arrondissement of Paris, situated between Montmartre and the Sacré-Cœur Basilica. The grounds contain green spaces, walking paths, and seating areas that offer views across the city.

The square is named after Félix Tournachon, known as Nadar (1820–1910), a caricaturist, writer, aeronaut and photographer. Its statue of the Chevalier de La Barre, first erected in 1905 by Armand Bloch in front of the Sacré-Cœur, was moved here in 1926 so as not to offend worshippers. It was melted down in 1941 under Vichy's non-ferrous metal drive; Emanuel Ball's replacement was inaugurated in 2001.

The square is named after Félix Tournachon, known as Nadar (1820–1910), a caricaturist, writer, aeronaut and photographer. Its centrepiece is a statue of the Chevalier de la Barre, executed in 1766 for refusing to salute a religious procession; the present bronze, by Emanuel Ball, was inaugurated in 2001.

Square Nadar is reached from Abbesses metro station (lines 2 and 12); the entrance is at 2, rue Saint-Éleuthère, between rue Azaïs and rue Saint-Éleuthère. Bus line 40 stops at Funiculaire. The gravel square is open ground with benches along its edges, and stacked stone steps rise on one side.

The pedestal's oval medallion reads "A CHARLES FOURIER" with the dates 1772-1837, yet the bronze figure above it is the chevalier de La Barre, executed in 1766. The monument was inaugurated in 2001, replacing a statue melted down in 1941 under Vichy's non-ferrous metal drive.