The Orkest van de Achttiende Eeuw (Orchestra of the Eighteenth Century) is a Dutch ensemble founded in 1981 by conductor Frans Brüggen. It specializes in performing music from the 18th century, particularly works from the Baroque and Classical periods, using period instruments to achieve an authentic sound. The orchestra is known for its commitment to historical performance practices, which include using original scores and techniques from the time of the composers. This approach allows them to present works by composers such as Mozart, Haydn, and Bach in a way that reflects the style and nuances of the era.