Ilmer is a village in the civil parish of Longwick-cum-Ilmer, in Buckinghamshire, England. It is at the foot of the Chiltern Hills about northwest of Princes Risborough, near the boundary with Oxfordshire.
Ilmer was an ancient parish. In 1934 it was abolished and the area became part of the new civil parish of Longwick-cum-Ilmer. At the 1931 census (the last before the abolition of the parish), Ilmer had a population of 40.
Toponymy
The village toponym is derived from the Old English for 'Ylla's boundary', referring to the ancient boundary with Oxfordshire. The Domesday Book of 1086 records the village as Imere.
Parish church
The nave of the Church of England parish church of Saint Peter dates from the 12th century.
Railway history
In 1899–1905 the Great Western and Great Central Joint Railway was built through the parish. In 1906 was opened on the line to serve the village. British Railways closed the halt in 1963. The railway remains open as part of the Chiltern Main Line from London.
In 1968, a scene from Albert R. Broccoli's Chitty Chitty Bang Bang was filmed along the railway line in which the Baron Bomburst's spies capture the wrong car with Lord Scrumptious inside.