Joseph Quinaux 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 of Brussels from 1876 until his death in Schaerbeek in 1895, conducting the landscape class. Among his pupils were Hippolyte Boulenger and Isidore Verheyden. The Rue Quinaux in Schaerbeek was named after him.