John Campbell White, 1st Baron Overtoun, DL, JP (21 November 1843 – 15 February 1908) 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 (where his chemical works was based), following being honoured in the same fashion by Dumbarton two years earlier, in recognition of his philanthropic endeavours.