Willys de Castro (1926–1988) was a pivotal figure in Brazilian modern and concrete art, best known for his contributions to the Neo-Concrete Movement (Movimento Neoconcreto) alongside artists like Lygia Clark and Hélio Oiticica. Born in Uberlândia, Brazil, he was not only a visual artist but also a poet, graphic designer, and musician—embodying a deeply interdisciplinary approach.