Nether Winchendon or Lower Winchendon is a village and civil parish in the Aylesbury Vale district of Buckinghamshire, England. It is near the county boundary with Oxfordshire, about 5.5 miles (9 km) west of Aylesbury and 2.5 miles (4 km) north of Haddenham. The toponym "Winchendon" is derived from the Old English for "hill at a bend". The Domesday Book of 1086 records Winchendon as Wincandone.