Molinari was born in Montreal of Italian heritage with parents from Cune (Borgo a Mozzano, Tuscany) and Naples, Campania. He began painting at age 13, and his existentialist approach to art was formed during a bout with tuberculosis at age 16, during which he read Nietzsche, Sartre, Piaget, and Camus. He studied at the École des Beaux-Arts de Montréal and the Montreal Museum of Fine Arts.
He practised abstraction in New York, inspired by Barnett Newman, and Jackson Pollock, then returned to Montreal where he produced some of the finest pieces of his career. He married Fernande Saint-Martin in 1958. Works by Molinari along with those of Ulysse Comtois represented Canada at the 1968 Venice Biennale. He won a Guggenheim Fellowship in 1967, was made an Officer of the Order of Canada in 1971, and won the Prix Paul-Émile-Borduas in 1980.He was a member of the Royal Canadian Academy of Arts.
His work is known for its focus on modular and contrasting colours, shapes, and lines. It is exhibited worldwide, including the National Gallery of Canada, the Musée d'art contemporain de Montréal, and the Guggenheim Museum and Museum of Modern Art in New York.
He died in Montreal. A retrospective exhibition of his works took place at the Gallery Valentin in 2011.
- Guido Molinari: The Colour of Memory 
- "Past Canadian Exhibitions". National Gallery of Canada at the Venice Biennale. National Gallery of Canada. Retrieved 12 October 2013.
- "Members since 1880". Royal Canadian Academy of Arts. Retrieved 11 September 2013.
- Mutation serielle verte-rouge
- Blue Quantifier #25
- Guido Molinari : The Colour of Memory
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