Victor-Louis Mottez was a French fresco painter, painter and portraitist.
He was born in Lille. His father was passionate about art and was himself a painter. Sent to Paris with a pension for some years, Victor was recalled due to the poor state of his father's finances and his studies were cut short. He followed courses at the École de dessin in Lille and worked under the direction of his father and his father's painter friends such as Édouard Liénard, student of Jacques-Louis David. He returned to Paris from 1828 to 1829 to enter the École des Beaux-Arts and at first studied under the direction of François-Édouard Picot, then as a free student of Dominique Ingres.

The Mottez family was highly religious and devoted to the House of Bourbon, and so the July Revolution in 1830 came as a catastrophe to them. Victor was again recalled to Lille by his father and married shortly afterwards. From there he made many trips, of which the longest and most notable was that to Italy and he came to consider its old masters as the absolute masters of painting. In Rome he met Ingres again - Ingres liked him very much and often gave him advice. His Christ in the Tomb (now in the église Sainte-Catherine de Lille) and The Martyrdom of Saint Stephen (now in the église Saint-Étienne de Lille) date to this era. Also on this trip to Italy he became hugely interested in fresco art—Mottez painted his wife Julie in this medium and, showing Ingres the end result, pulled it off the wall at Ingres' request (it was later given to the Louvre by Mottez's two children).

Returning to France in 1838, he set up shop in Paris and exhibited at the Paris Salons, especially turning more and more towards the neglected genre of frescoes, notably religious ones. He also translated the Treatise by the 14th century Florentine painter Cennino Cennini and learned from his techniques. His most remarkable works are those for churches (at Église Saint-Germain-l'Auxerrois in the 1840s, and at the Saint-Séverin in the 1850s), which were admired by Ingres and Delacroix. However, the clergy's hostility to them, the materials used, the saltpeter walls and their situation all meant that they were already deteriorated by the end of the 19th century and are now largely lost (except for Saint Martin cutting his cloak in two at St-Germain l'Auxerrois), though Mottez's cartoons for them survive.

During the same years he frequented the Bertins' salon, alongside the main writers and artists of the time (a sketch of his for a portrait of Victor Hugo survives). He produced two frescoes for this salon, destroyed in 1854. After the 1848 Revolution Mottez set out for the United Kingdom, where he produced several portraits of British nobles and personalities and the exiled minister François Guizot, which were exhibited at the Royal Academy salons. He was an excellent portraitist throughout his career and it was that which mainly occupied him in the last years of his career. He returned to France in 1853 and worked with Delacroix at the Église Saint-Sulpice, at the start of the 1860s, where their highly opposed styles clearly showed the struggle between the neo-classical and romantic visions. Maurice Denis considered these frescoes at St-Sulpice (another Saint Martin) as "unforgettable". He designed the stained glass windows at the église Saint-Maurice de Lille.

Victor Mottez died on 7 June 1897 in Bièvres.