Joseph Quinaux (29 March 1822 – 24 May 1895) was a Belgian painter, known especially for his landscapes.

Quinaux was born in Namen. He was a lecturer and teacher of painting at the Académie Royale des Beaux - Arts in Brussels from 1876 until his death in Schaarbeek in 1895, conducting the landscape class. Among his pupils were Hippolyte Boulenger and Isidore Verheyden. The Rue Quinaux in Schaarbeek was named after him.