Guillaume Cornelis van Beverloo (3 July 1922 – 5 September 2010) was a Dutch artist.

Corneille was born in Liège, Belgium, although his parents were Dutch and moved back to the Netherlands when he was 12.

He studied art at the Academy of Art in Amsterdam, in the Netherlands. He was one of the founders of the REFLEX movement in 1948 and in 1949 he was also one of the founders of the COBRA movement, which has had great influence on Scandinavian art.

Corneille was inspired by the drawings of children, and believed in the importance of approaching children with art that connects with their experience.