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Guillaume Cornelis van Beverloo (1922 – 2010), better known under his pseudonym Corneille, was a Dutch artist.

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. He was active within the group from the beginning, not only painting but also publishing poetry in the Cobra magazine. He was a cofounder of the Experimentele Groep in Holland. Corneille was inspired by the drawings of children, and believed in the importance of approaching children with art that connects with their experience. 

The poetic Corneille was strongly influenced by Miró and Klee. After the group dissolved in 1951 he moved to Paris and began collecting African art. These artifacts became evident in his works, which began to take on a more imaginative style, like landscapes seen from a bird's eye view, exotic birds and stylised forms. His work is in the collection of the Centre Georges Pompidou.

Until his death Corneille lived and worked in Paris, and made visits to Israel where he worked with the Jaffa Atelier.