Wycombe Marsh is an area of High Wycombe, Buckinghamshire, England. It lies on the River Wye and the A40 road, approximately 1.5 miles (2.4 km) south-east of High Wycombe town centre, and approximately 1 mile (1.6 km) north-west of Loudwater. Wycombe Marsh is in the Ryemead ward of High Wycombe, which had a population of 7,188 at the 2011 Census.