Jules Alphonse Ernest Renoux was a French painter working during the height of French Impressionism and the Belle Epoque.

Renoux was the son of Jules Alphonse Renoux and Ernestine Veron. He showed early a talent for drawing and was still young when he went to live in Paris with his mother; her husband had abandoned her and had gone off to fight as a volunteer in the Franco-Prussian War of 1870. A student of Jean-Léon Gérôme and Alfred Philippe Roll, Renoux studied at the École des Beaux-Arts and collaborated with Roll on the painted ceilings of the Hôtel de Viller, the Sorbonne and the Petit Palais.

Count de Zogheb, a well-known personality of the Belle Epoque, commissioned Renoux to paint his portrait, which was shown in the Salon of 1901. Count de Zogheb subsequently purchased many other Renoux paintings; this association earned Renoux two medals, the Imperial Order of Medjidieh and the Cross of the Knights of the Portuguese Military Order of Christ (which, with typical modesty, he never wore). A later patron was the industrialist Auguste Magnère, an amateur artist whom Renoux tutored.

Renoux exhibited in the Paris gallery of Georges Bernheim in 1916, and the public reception was an encouraging success, resulting in the sale of twelve paintings. From 1922 Renoux exhibited at the Salon des Artistes Francais where he became a member. Ten of Renoux's paintings are on permanent display at the Petit Palais, Musée des Beaux Arts de la ville de Paris.

Renoux employed a palette based in yellow-orange and ochre in which he painted street scenes admired for their understated beauty and agility of hand. Renoux liked painting the human form, frequently with members of his family as sitters. But he was shy and disliked sketching in the open streets. He often chose some obscure corner from which to draw, which explains the interesting and unusual perspective of some of his paintings. As The Times of London wrote, "He might in the broad sense of the term be called Impressionist, being concerned with the open-air effect, taking particular pleasure in the dapple of sunlight on tree shaded avenues. Accurate in perspective, he used it with an eye to pictorial value and showed particular skill in placing his vividly sketched figures at varying distances from the spectator."

Renoux married Berthe Madeleine in 1895, although his mother opposed the marriage on financial grounds. His wife was a frequent model.