Aldbourne is a village and civil parish about 6 miles (10 km) northeast of Marlborough in Wiltshire, England. It is in a valley in the south slope of the Lambourn Downs, part of the North Wessex Downs Area of Outstanding Natural Beauty. From here an unnamed winterbourne flows and joins the River Kennet 4 miles (6 km) south near the village of Ramsbury. The 2011 Census recorded the parish population as 1,833.