The Loiret () is a long river in France, a left tributary to the Loire. Its waters come from infiltrations from the Loire.
Its course is completely within the Loiret département, to which it gives its name.
thumb|left|Le Bouillon
The Loiret, south of Orléans, with its picturesque former mills, is a popular destination for walking and boating trips. The source of the Loiret is a feature of the Parc Floral de la Source (Le Bouillon), and its mouth in Saint-Hilaire-Saint-Mesmin, southwest of Orléans.