Mario Nigro (Pistoia, 28 June 1917 – Livorno, 11 August 1992) was an Italian painter.
He graduated in chemistry and pharmacology at the University of Pisa, in 1940 and 1947 respectively, while also studying music and painting.
Having joined the Movimento d’Arte Concreta after an initial post-Cubist period, he moved to Milan in 1949 and held his first solo show at the Libreria Salto.
He worked in the field of abstract art from the late 1940s on, producing a number of different series, and took part in the Salon des Réalités Nouvelles in Paris in 1951.
In 1968 Nigro was invited again, this time with an entire room exclusively dedicated to his work, cementing his reputation on an international level.