Square Édouard-Vaillant, Urban park in 20th arrondissement, France.

Square Édouard-Vaillant is a public garden in the 20th arrondissement, covering 8,085 m² between the town hall and Tenon Hospital. It has a central music kiosk, greenhouses, and a winter garden in the Second Empire style. The park holds remarkable trees, including a common plane planted in 1880 (28 m tall, 500 cm circumference) and a Byzantine hazelnut planted in 1916.

Created in 1879, the square was first named square Tenon after the surgeon Jacques-René Tenon, whose hospital borders it to the east. It later took the name of Édouard Vaillant (1840-1915), deputy for the constituency and municipal councillor elected in 1884. The bronze bust of Dr. Métivier was melted down during the Occupation, leaving only its pedestal.

The square is named after Édouard Vaillant (1840–1915), deputy for the constituency and municipal councillor elected in 1884; it was first called square Tenon, after the surgeon Jacques-René Tenon. A kiosk stands at its centre, and the Tenon hospital along its eastern side was the first in Paris staffed by lay personnel.

The square has an entrance on each of its four bordering streets: avenue Gambetta, rue de la Chine, rue Belgrand and rue du Japon. Métro lines 3 and 3 bis stop at Gambetta station nearby. The Tenon hospital lies along the eastern side, and the 20th arrondissement town hall stands beside the garden.

The square holds three trees listed as remarkable Paris trees: a horse chestnut 26 m tall, a common plane planted in 1880 (28 m, 500 cm girth) and a Byzantine hazel planted in 1916. The bronze bust of Dr. Métivier was melted down during the Occupation; only its pedestal remains.