Marcel Thiry (13 March 1897 – 5 September 1977) was a French-speaking Belgian poet. During World War I, he and his brother Oscar served in the Belgian Expeditionary Corps in Russia. He was awarded the Prix Valery Larbaud in 1976 for , a book of poems reminiscent of Blaise Cendrars and Guillaume Apollinaire. He is the father of virologist Lise Thiry.