Butterfly Conservation is a registered charity dedicated to the conservation of butterflies and moths

The Hertfordshire & Middlesex Branch has over 1000 members and covers the administrative county of Hertfordshire and the Watsonian Vice-county of Middlesex (VC21).

The London Boroughs included within the Branch area are Barnet, Brent, Camden, City of London, City of Westminster, Ealing, Enfield, Hackney, Hammersmith & Fulham, Haringey, Harrow, Hillingdon, Hounslow, Islington, Kensington & Chelsea, Richmond (north of the Thames), Tower Hamlets and the Surrey District Council of Spelthorne.