Overtoun House is a 19th-century country house and estate in West Dunbartonshire, Scotland. Situated on a hill overlooking the River Clyde, it is two kilometres (1.2 mi) north of the village of Milton and three kilometres (1.9 mi) east of the town of Dumbarton. The house, an example of Scottish Baronial architecture, was built in the 1860s, and was donated to the people of Dumbarton in 1938. It was subsequently a maternity hospital, and now houses a Christian centre. The house is protected as a category A listed building, while the grounds are included in the Inventory of Gardens and Designed Landscapes in Scotland. Landscape features include the Overtoun Bridge on the approach road, designed by H. E. Milner.

John Campbell White, 1st Baron Overtoun, was a Scottish chemical manufacturer, supporter of religious causes, philanthropist and Liberal politician. He was raised to the peerage by Gladstone in 1893, and in 1905 was granted the Freedom of the City of Rutherglen, following being honoured in the same fashion by Dumbarton two years earlier, in recognition of his philanthropic endeavours.