1300 Marcelle with the provisional designation 1934 CL is a carbonaceous asteroid in the middle of the asteroid belt ~30 km in diameter. It was discovered on 10 February 1934 by french astronomer Guy Reiss in the Algeirs Observatory and named after his daughter.

Marcelle orbits the Sun in the central main-belt at a distance of 2.8–2.8 AU once every 4 years and 8 months (1,694 days). Its orbit has an eccentricity of 0.01 and an inclination of 10° with respect to the ecliptic. The body's observation arc begins at Uccle Observatory, four days after its official discovery at Algiers, as no precoveries were taken, and no prior identifications were made.