Square Georges-Cain, Urban park in 3rd arrondissement, Paris, France.

Square Georges-Cain is a garden near a major museum in Paris's historic core, filled with Renaissance stone fragments and sculptures. These pieces are arranged along paved pathways framed by flowering plants and mature trees.

This site brings together architectural remnants from two major Paris buildings destroyed in the 19th century. These pieces were later gathered and arranged here when the garden was created in 1923.

The garden is named after Georges Cain (1856–1919), a painter and writer who was curator of the Musée Carnavalet from 1897 to 1914. Since 1931 it has been open to the public. At dusk, a solar-powered acoustic module by Erik Samakh plays a nightingale's song recorded at the Château de Sauvigny in May 1990.

The garden is entered from Rue Payenne through a gate on its west side; the Carnavalet museum borders it to the north and east, and the Lycée Victor-Hugo to the south. Dogs on a leash are allowed. Metro line 1 stops at Saint-Paul and line 8 at Chemin Vert. The sound piece Le Rossignol de Heinz is best heard at dusk.

The garden functions as a large open-air museum where visitors can examine historical stone pieces and ornaments from different eras up close. Rather than viewing ancient stones behind glass, you walk directly among them.