Bonhill is a town in the Vale of Leven area of West Dunbartonshire, Scotland. It is sited on the Eastern bank of the River Leven, on the opposite bank from the larger town of Alexandria. The area is mentioned in a charter of 1225 giving the monks from Paisley Abbey fishing rights on the east bank of the River Leven at the Linbrane pool. Bonhill Parish was noted in a charter of 1270 as "the parish of Buthehille", and the name became Bonyle about 1550, with the variants Binnuill, Bonuil and Bonill appearing before Bonhill was adopted by 1700. In 1650 this small poor parish was enlarged, and since then the Parish has included most of the towns and villages in the Vale of Leven.