John Olmius, 1st Baron Waltham, of New Hall, Boreham, Essex, was a British landowner and Whig politician who sat in the House of Commons between 1737 and 1762.
- Occupation
- politician
- Position held
- member of the 11th Parliament of Great Britain, member of the 8th Parliament of Great Britain, member of the 9th Parliament of Great Britain, member of the 12th Parliament of Great Britain
- Born
- July 18, 1711
- Died
- October 5, 1762
