Usines Delin was a Belgian automobile and motorbike manufacturer from the city of Leuven, capital of the province of Flemish Brabant.

J. Delin founded a company in 1890 for the production of bicycles under the name Derby. From 1898, the company operated under the name Usines Delin. Société Anonyme, Fabrique d'Automobiles et de Cycles. In 1899, the first automobile was produced. In January 1902, the company was put into liquidation and taken over by competitor Mathieu.

In March 1899, the first car was shown at an exhibition in Brussels. It had a two-cylinder engine from the French Loyal, a clutch gearbox and Duc bodywork. A Victoria Combination voiturette, a tricycle with a 2.5 HP engine and a motorbike with a 1.75 HP engine followed in 1900. From 1901, there were four models: a two-seater voiturette with a 2.75 hp engine, a four-seater with a 4 hp engine, a four-seater tonneau with an 8 hp engine and a van with a 4 hp engine.

Three vehicles still exist today: one at the Smålands Bil-, Musik och Leksamsmuseum in Rydaholm, Sweden, one at the Museo del Automóvil in Uruguay and one in the hands of a Belgian collector who occasionally uses it in the London to Brighton Veteran Car Run.