Oregano (Origanum vulgare) is a species of flowering plant in the mint family Lamiaceae. It is sometimes called wild marjoram, and its close relative, O. majorana, is known as sweet marjoram. Both are very widely used as culinary herbs, especially in Italian and French cuisine. Oregano is also an ornamental plant, with numerous cultivars bred for varying leaf colour, flower colour and habit.

Oregano contains chemicals that might help reduce cough and spasms. Oregano also might help digestion by increasing bile flow and fighting against some bacteria, viruses, fungi, intestinal worms, and other parasites.