Viscount Melbourne, of Kilmore in the County of Cavan, was a title in the Peerage of Ireland held by the Lamb family.

He married Charlotte, daughter of Thomas Coke, through which marriage Melbourne Hall in Derbyshire came into the Lamb family.

[1] He was succeeded by his son, Peniston, the second Baronet, who sat as Member of Parliament for Ludgershall, Malmesbury and Newport, Isle of Wight, and who, in 1770, was raised to the Peerage of Ireland as Baron Melbourne, of Kilmore in the County of Cavan.

[1] He was succeeded by his son, William Lamb, 2nd Viscount Melbourne, who was a noted Whig politician and served as Prime Minister of the United Kingdom in 1834 and 1835–1841.

He was Queen Victoria's first Prime Minister, and she greatly relied upon his wisdom and experience in her early days on the throne, to the point where Melbourne's political foes complained that he had enthralled her.