Whaddon is a village and civil parish in South Cambridgeshire, England, 6 kilometres (3.7 mi) north of Royston.

Its entire western boundary follows the Roman Ermine Street (now the A1198), separating it from Bassingbourn and Wendy, and its northern border follows the River Cam (or Rhee), dividing it from Wimpole and Orwell.

The Basin, an octagonal pool of around 150 metres in diameter, was added in 1721 just south of the river but was cleared a few decades later and filled with soil in 1968.

[4] The parish church of St Mary consists of a chancel, five-bay aisled and clerestoried nave, south porch, and west tower.

Though originally part of Melbourn, The Queen Adelaide opened south of Whaddon Green in around 1900, closing in 1956.