An orangerie (original French word, meaning 'orangery', and sometimes translated as 'greenhouse') is a closed building equipped with large windows and a heating system in which, during the bad season, citrus trees planted in trays or pots, as well as other plants, are sheltered from frost. In Italy, a country in which the fashion for Renaissance gardens in recreational villas appeared, the arches under which citrus trees were planted, which were protected from the cold of winter, were glazed—as glass manufacturing technology made it possible to manufacture large surfaces of transparent glass. Curiously they are called limonaia.

The term "orangerie" also previously meant orange plantations in France, which are now called "orangeraies".

The orangerie of the Louvre Palace (1617) inspired imitations that were not eclipsed until the development of modern greenhouses in the 1840s. An orangerie was a sign of distinction in aristocratic residences during the 20th and 30th centuries.