The London Butterfly House was a visitor attraction in Brentford, Middlesex, England where the public could view butterflies, birds, reptiles, amphibians, insects, and arachnids. Set in Syon Park, the grounds of Syon House, the facility consisted of three 'purpose built' greenhouses situated overlooking a lake. The facility contained hundreds of the world's most exotic species of butterfly, along with descriptions and illustrations. It also contained a small aviary. There was a proposal to build a replacement Butterfly House in Gunnersbury Park, but this was rejected.