Upper Winchendon or Over Winchendon is a village and civil parish in the Aylesbury Vale District of Buckinghamshire, England. It is about south of Waddesdon and west of Aylesbury. A mid-air collision on 17 November 2017 between a plane and a helicopter just outside the village was referred to by much of the press as the "Waddesdon Manor air incident".

  • Arthur Goodwin (died 1643), lawyer and Parliamentarian, was lord of the manor of Upper Winchendon.
  • Philip Wharton, 4th Baron Wharton (1613–1696), soldier, Parliamentarian and art collector, gained the manor of Upper Winchendon through his second wife, Jane Goodwin, only daughter of Arthur Goodwin. He and other family were painted by Anthony van Dyck.
  • Samuel Clarke (1626–1701), nonconformist minister and Biblical scholar, spent 26 years in Upper Winchendon under the auspices of Philip Wharton, after ejection from the rectory of Grendon Underwood in 1662, and set up on an Independent congregation there.
  • Thomas Wharton, 1st Marquess of Wharton (1648–1714), Whig politician, rake and Lord Lieutenant of Ireland, was the eldest son of Philip Wharton. The lyrics of the marching song "Lillibullero" are attributed to him. He was buried at Upper Winchendon.
  • Goodwin Wharton (1653–1704), Whig politician and autobiographer, was born in Upper Winchendon on 8 March 1653 as third son of Philip Wharton.
  • Anne Wharton (1659–1685), wife of Thomas Wharton, was a poet and dramatist.

2017 mid-air collision

On 17 November 2017, a mid-air collision occurred between an aeroplane and a helicopter near Waddesdon Manor, resulting in four deaths, two on each aircraft. The crash happened just outside the Manor grounds, close to the village of Upper Winchendon. The wreckage landed in dense woodland. and a Guimbal Cabri G2 registration G-JAMM, each with two people on board. from the crash site. The Cessna had previously been involved in an incident in 1993.

The pilot of the helicopter was Mike Green, an instructor who was training a student pilot at the time. The student pilot was later announced as being a captain in the Vietnamese Army, who was training to become a military flight instructor. The bodies of all four victims were removed from the site on 19 November.