The Opinel knife, or simply Opinel, is a brand of simple, wooden-handled pocket-knife manufactured since 1890 in the town of Saint-Jean-de-Maurienne in the Savoie region of France.

The Opinel knife was invented by Joseph Opinel in 1890 in Savoie as a simple working man's or peasant's knife. It proved popular with the local farmers, herdsmen, and paysans-vignerons (peasant winemakers) of the area. In 1897, a series of twelve sizes, numbered 1 to 12, was developed. From 1901-1903, Joseph Opinel built his first factory in Pont de Gévoudaz and produced a machine for mass production of the knife's wooden handles.

To distribute his new range of knives, Opinel utilized the time-honored method of hiring peddlers to sell the knife, installing a small shop near the Chambéry railway junction, where the knives became popular with PLM railroad workers, who in the course of their work spread word of the new knife all over France. By 1909, Opinel had registered his first trademark for the Opinel knife, choosing the main couronnée ('crowned hand") as his emblem. A few years later Opinel annual sales were in the hundreds of thousands, and by the start of World War II as many as 20 million knives had been sold.