Oregano, also known as wild marjoram, is an aromatic, spicy Mediterranean herb sold as fresh sprigs or chopped dried leaves. This popular herb is used to season all types of savory dishes, especially tomato-based recipes.

Aromatic, warm and slightly bitter. Oregano largely varies in intensity: Good quality is so strong that it almost numbs the tongue, but the cultivars adapted to colder climate have often unsatisfactory flavor.

It belongs to the Labiatae family and bears attractive white to purplish flowers and showy bracts in summer. Oregano tends to be quite variable when grown from seed. Leaves are green to gray-green and may be hairy or smooth.

Many species contribute to the oregano herb of commerce, to the extent that oregano should be considered more a flavor than a particular species. European oregano is generally derived from O. vulgare, but other species, particularly O. heracleoticum, Coridothymus capitatus (syn. Thymus capitatus) and T. mastichina are also used. Mexican oregano (sometimes known as Mexican sage) is derived mainly from Lippia graveolens, but other Lippia species and Coleus, Lantana and Hyptis species contribute to herb of commerce.

O. vulgare is widely distributed through Europe to central Asia. Other species mentioned tend to have a more restricted range in western Europe and the Mediterranean region.