Square Louise-Michel, Urban park in Montmartre district, Paris, France.

Square Louise-Michel is a 23,737 m² terraced park on the slope of Montmartre, below the Sacré-Cœur. Two horseshoe ramps lead to a lower terrace with a balustrade; from there, straight and diagonal stairs and sloping paths climb to an upper terrace above Paul Gasq's 1932 fountain. The park has lawns, trees, and a carousel at the foot of the main stairs.

A first small Square Saint-Pierre opened at the foot of the hill on 3 April 1877. Adolphe Alphand began a larger square in 1889, continued by Paul Abadie and then Jean Camille Formigé, with work halted by the First World War. Inaugurated in 1927 as Square Willette, it was renamed Square Louise-Michel on 28 February 2004.

The name honours Louise Michel (1830–1905), a leading figure of the 1871 Paris Commune; the square was renamed on 28 February 2004, replacing the name of illustrator Adolphe Willette. In March 2021 Mayor Anne Hidalgo inaugurated the Allée de l'Île-des-Pins, a path from the rue Muller entrance along rue Ronsard, with a remembrance araucaria for communards deported to New Caledonia.

The location is easily accessible by metro and has elevators and stairways for moving through the grounds. Comfortable walking shoes are recommended since the terrain includes numerous steps and varying elevation levels.

A monumental fountain designed by Paul Gasq depicting sea deities and mythical creatures sits at the base of the main staircase. This elaborate artwork is an often overlooked detail that reveals the park's artistic aspirations.