Drigue Billers Olmius, 2nd Baron Waltham (12 March 1746 – 10 December 1786 or 10 February 1787), was a British politician.

Olmius was the son of John Olmius, 1st Baron Waltham, by Anne, daughter of Sir William Billers, Lord Mayor of London

Lord Mayor of London

The Right Honourable Lord Mayor of London is the legal title for the Mayor of the City of London Corporation. The Lord Mayor of London is to be distinguished from the Mayor of London; the former is an officer only of the City of London, while the Mayor of London is the Mayor of Greater London and...

 in 1733. He succeeded his father in the barony in October 1762, aged 16. This was an Irish peerage

Peerage of Ireland

The Peerage of Ireland is the term used for those titles of nobility created by the English and later British monarchs of Ireland in their capacity as Lord or King of Ireland. The creation of such titles came to an end in the 19th century. The ranks of the Irish peerage are Duke, Marquess, Earl,...

 and gave him a seat in the Irish House of Lords

Irish House of Lords

The Irish House of Lords was the upper house of the Parliament of Ireland that existed from mediaeval times until 1800. It was abolished along with the Irish House of Commons by the Act of Union.-Function:...

 although not in the English House of Lords

House of Lords

The House of Lords is the upper house of the Parliament of the United Kingdom. Like the House of Commons, it meets in the Palace of Westminster....

. In 1768 he was returned to parliament as one of four representatives for Weymouth and Melcombe Regis

Weymouth and Melcombe Regis (UK Parliament constituency)

Weymouth and Melcombe Regis was a parliamentary borough in Dorset represented in the English House of Commons, later in that of Great Britain, and finally in the Parliament of the United Kingdom. It was formed by an Act of Parliament of 1570 which amalgamated the existing boroughs of Weymouth and...

, a seat he held until 1774. From 1784 until his death in 1787 he sat as Member of Parliament

Member of Parliament

A Member of Parliament is a representative of the voters to a :parliament. In many countries with bicameral parliaments, the term applies specifically to members of the lower house, as upper houses often have a different title, such as senate, and thus also have different titles for its members,...

 for Maldon

Maldon (UK Parliament constituency)

Maldon is a county constituency represented in the House of Commons of the Parliament of the United Kingdom. It elects one Member of Parliament by the first past the post system of election...

.

Lord Waltham died childless in February 1787, aged 40, when the barony became extinct. He was succeeded in the family estates by his sister, the Honourable Elizabeth. She was the wife of John Luttrell, 3rd Earl of Carhampton, who assumed the additional surname of Olmius.