William Montagu Hay, 10th Marquess of Tweeddale, KT, DL, known before 1878 as Lord William Hay or Lord William Montagu Hay, was a Scottish landowner, peer and politician. He was born at Yester House, near Gifford, East Lothian, and served in British India as a member of the Bengal Civil Service and later as a Liberal Member of Parliament.
- Occupation
- politician, aristocrat, lord of the manor
- Position held
- member of the 19th Parliament of the United Kingdom, member of the 21st Parliament of the United Kingdom, member of the House of Lords
- Born
- January 29, 1826
- Died