Maurice Edgard Vieux (14 April 1884, Savy-Berlette near Valenciennes – 28 April 1951, Paris) was a French violist whose teaching at the Conservatoire de Paris plays a key role in the history of the viola in France. Vieux composed several works for the viola, notably his Vingt Études pour Alto (20 Études for Viola) published by Alphonse Leduc in 1927. The Maurice Vieux International Viola Competition (Le Concours International d'Alto Maurice Vieux) was established in 1983 by the French viola society Les Amis de l'Alto. The first-prize winner was the German violist Tabea Zimmermann.