The Detmold Open-air Museum (German: LWL-Freilichtmuseum Detmold – Westfälisches Landesmuseum für Volkskunde|link=no; English: "LWL Open-air Museum Detmold – Westphalian State Museum for Folkloristics") is a museum at Detmold in the Ostwestfalen-Lippe region of North Rhine-Westphalia, Germany. It was founded, together with the Hagen Open-air Museum, in 1960, and was first opened to the public in the early 1970s. The museum is run by the (LWL, regional authority for Westphalia and Lippe within North Rhine-Westphalia).
Over 100 historic, rural buildings were transported and reconstructed from across the state, including schools, farmhouses, thatched cottages, and windmills. Over 200acres of bucolic fields and ponds are available for horse-drawn carriage rides, walking tours, and picnicking. The museum also hosts special exhibitions and interactive craft demonstrations, such as blacksmithing and pottery-making. It is open seasonally, between 1 April and 31 October.