John Webb (1611 – 24 October 1672) was an English architect and scholar, who collaborated on some works with Inigo Jones.

He was born in Little Britain, Smithfield, London, and died in Butleigh in Somerset. He had a close association with fellow architect and theatre designer Inigo Jones, for whom he worked as an assistant from 1628. Webb married Anne Jones who was described as a "kinswoman" of Inigo Jones. Webb included some details of Jones's career in his two books about Stonehenge.

In the 1640s and 1650s, Jones and Webb jointly designed Wilton House (near Salisbury, Wiltshire) with its distinctive Single and Double Cube rooms.

Webb's earliest known drawings were made for the Barber Surgeons' Hall in London in 1636–7, and in 1638 he designed a lodge for John Penruddock at Hale in Hampshire and stables for a Mr Featherstone, but it is unclear if these were built.

At the beginning of the Civil War, Jones left London to attend the King at Oxford. He was later in Basing House and was captured at the end of the siege. Webb stayed in London, having been appointed Deputy Surveyor by Jones. He acted as a spy for Charles I, probably out of zeal rather than by appointment, and sent the plans of London's Lines of Communication (new fortifications) together with the number and location of the newly mounted guns.

In 1649 Webb made a number of drawings for Durham House, an unrealised project for a townhouse for the Earl of Pembroke on the Strand. In one drawing the emphasised keystones of the entrance and ground floor windows recall an early design by Jones for the Queen's House.

Upon Jones' death in 1652, Webb inherited a substantial fortune as well as a library of drawings and designs, many of which dated back to Jones' influential travels to Italy.

In 1654 Webb designed the first classical portico on an English country house, at The Vyne in Hampshire. In the Corinthian style, this portico stamps this older house as Palladian, 50 years before the birth of Lord Burlington.