The Roundhouse is a performing arts and concert venue situated at the Grade II* listed former railway engine shed in Chalk Farm, London, England. The building was erected in 1846–1847 by the London & North Western Railway as a roundhouse, a circular building containing a railway turntable, but was used for that purpose for only about a decade. After being used as a warehouse for a number of years, the building fell into disuse just before World War II. It was first made a listed building in 1954.

In rail terminology, a railway turntable or wheelhouse is a device for turning round railway rolling stock, usually locomotives, so that they face the direction they came from. It is especially used in areas where economic considerations or a lack of sufficient space have served to weigh against the construction of a turnaround wye. Railways needed a way to turn steam locomotives around for return journeys, as their controls were often not configured for extended periods of running in reverse; also many locomotives had a lower top speed in reverse. Most diesel locomotives, however, can be operated in either direction, and are considered to have "front ends" and "rear ends". When a diesel locomotive is operated as a single unit, the railway company often prefers, or requires, that it be run "front end" first. When operated as part of a multiple unit locomotive consist, the locomotives can be arranged so that the consist can be operated "front end first" no matter which direction the consist is pointed. Turntables were also used to turn observation cars so that their windowed lounge ends faced toward the rear of the train.