Batty Langley (baptised 14 September 1696 – 3 March 1751) was an English garden designer, and prolific writer who produced a number of engraved designs for "Gothick" structures, summerhouses and garden seats in the years before the mid-18th century.
An eccentric landscape designer, he gave four of his sons the names , Euclid, Vitruvius and Archimedes. He published extensively, and attempted to "improve" Gothic forms by giving them classical proportions.
Langley was baptised in Twickenham, Middlesex, the son of a jobbing gardener Daniel Langley and his wife Elizabeth. He bore the name of David Batty, one of his fathers' patrons. He started worked as a gardener, inheriting some of his father's clients in Twickenham, then a village of suburban villas within easy reach of London by a pleasant water journey on the Thames. An early client was Thomas Vernon of Twickenham Park.
He married Anne Smith in February 1719. They had four children, but she died in June 1726. He had ten further children with his second wife, Catherine.
Langley moved into surveying and landscape gardening. He published his first book, Practical Geometry, in 1726. Inspired by Switzer's Ichonnographcica Rustica of 1718, Langley advocated more irregular, informal gardens, with rococo "arti-natural" landscaping. His sinuous forms predated Hogath's line of beauty.
For the Palladian house built at Twickenham by James Johnston in 1710 (later "Orleans House", demolished 1926), Langley, probably on his own endeavour, prepared and published a garden plan, which offered an encyclopaedia of the garden features that were swiftly becoming obsolete by the time the plan (illustration, right) was published in Langley's A Sure Method of Improving Estates (1728): here are several mazes, a "wilderness" with many tortuous path-turnings, cabinets de verdure cut into dense woodland, formal stretches of canal and formally shaped basins of water, some with central fountains, a central allée of trees leading to an exedra.