John Campbell, 3rd Earl of Breadalbane

John Campbell, 3rd Earl of Breadalbane and Holland KB (10 March 1696 – 26 January 1782), styled Lord Glenorchy from 1716 until 1752, was a Scottish nobleman, diplomat and politician.

Campbell was the son of John Campbell, 2nd Earl of Breadalbane and Holland and Henrietta Villiers. He was educated at Christ Church, Oxford.

He was Envoy to Denmark from 1718, and ambassador to the Russian Empire from 1731. He was a Lord of the Admiralty in 1741 until the dissolution of Sir Robert Walpole's government the following year.

He was Member of Parliament for Saltash in 1727 and 1734, for Orford from 1741, and was a Scottish representative peer from 1752. He was Master of the Jewel Office from 1745–56, was awarded a DCL from Oxford University in 1756, and served as Justice in Eyre south of the Trent from 1756 to 1765 and Vice-Admiral of Scotland from 1776.

Lord Breadalbane and Holland was married on 20 February 1717 to Lady Amabel de Grey, a daughter of Henry Grey, 1st Duke of Kent and Jemima Crew. Lady Amabel died on 2 March 1726 leaving 2 children:

The Earl married a second time to Arbella Pershall on 23 January 1730. They also had 2 children:

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