The Cockpit-in-Court (also known as the Royal Cockpit) was an early theatre in London, located at the rear of the Palace of Whitehall, next to St. James's Park, now the site of 70 Whitehall, in Westminster.
The structure was originally built by Henry VIII, after he had acquired Cardinal Wolsey's York Place to the north of the Palace of Westminster, following the Cardinal's downfall in 1529. It was one of a number of new pleasure buildings constructed for King Henry's entertainment, including a real tennis court, a bowling alley, and a tiltyard, and was used as an actual cockpit; that is, an area for staging cockfighting. Thus enlarged, the Palace of Whitehall became the main London residence of the Tudor and Stuart Kings of England, and the Palace of Westminster was relegated to ceremonial and administrative purposes only.
The Cockpit ceased to be used for cockfighting in Jacobean times, and was used instead as a private theatre and as chambers for members of the Royal Household. It was redesigned in 1629 for Charles I by Inigo Jones as a private venue for staging court masques. It was the second cockpit that Jones had redesigned as a theatre, the other being the Cockpit Theatre in Drury Lane, which was renovated after a fire in 1617.
After the London theatre closure of the Interregnum, the Cockpit returned to use under Charles II, and was refitted in 1662. A new dressing room was added for female players, whose presence onstage was a recent theatrical innovation; its walls were decorated with green baize, one possible origin of the theatrical term "green room" for a dressing room.Samuel Pepys records attending several plays at the Cockpit in his diary.