John Renwick McAslan is a British architect.

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.