Square Charles-Péguy, Urban park in Bel-Air district, Paris, France.

Square Charles-Péguy is the largest municipal square in the 12th arrondissement, covering 13,045 m² with a 2,860 m² extension added in January 2008. A broad light-grey paved walkway runs straight through the centre between rows of trees, flanked by lawns, a long bed of red and white flowers behind a low green metal fence, and a wooden bench beside a square grey stone block.

The park was created in 1989 on former railway land that once connected the Petite Ceinture line with the Bastille line. This transformation from industrial transport corridor to public green space shapes its character.

The square is named after Charles Péguy (1873–1914), the French writer born in Orléans. A separate Rue Péguy in the 6th arrondissement has carried his surname alone since 1926, without the first name. The square is one of four green spaces linked by the Coulée verte René-Dumont walking route.

The square has three entrances: Rue de Montempoivre, Rue Marie Laurencin and Rue Rottembourg. Bel-Air station on metro line 6 and the Montempoivre stop on tram line 3a are the nearest public transport. It is one of four green spaces linked by the Coulée verte René-Dumont walkway.

The square is one of four green spaces linked by the Coulée verte René-Dumont, a planted walkway that follows the old Petite Ceinture railway. Its three entrances are on Rue de Montempoivre, Rue Marie Laurencin and Rue Rottembourg. The writer Charles Péguy, killed in 1914, also gave his surname to a street in the 6th arrondissement, the Rue Péguy, named in 1926.