| Honorific Prefix: | The Right Honourable |
| The Earl of Camperdown | |
| Office: | Civil Lord of the Admiralty |
| Term Start: | 1870 |
| Term End: | 1874 |
| Predecessor: | Sir George Trevelyan |
| Successor: | Sir Massey Lopes |
| Birth Name: | Robert Adam Philips Haldane Haldane-Duncan |
| Birth Date: | 28 May 1841 |
| Education: | Eton College |
| Alma Mater: | Balliol College, Oxford |
| Parents: | Adam Haldane-Duncan, 2nd Earl of Camperdown Juliana Cavendish Philips |
| Relations: | George Haldane-Duncan, 4th Earl of Camperdown (brother) |
Robert Adam Philips Haldane Haldane-Duncan, 3rd Earl of Camperdown (28 May 1841 – 5 June 1918), styled Viscount Duncan from 1859 to 1867, was a British Liberal politician.
Camperdown was the eldest son of Adam Haldane-Duncan, 2nd Earl of Camperdown, and his wife Juliana Cavendish (née Philips). His father served as MP for Southampton, Bath, and Forfarshire. His sister was Julia Janet Georgiana Haldane-Duncan, a notable artist and Lady of the Bedchamber to Queen Victoria who married George Abercromby, 4th Baron Abercromby. His younger brother was George Haldane-Duncan, 4th Earl of Camperdown.[1]
He was educated at Eton and Balliol College, Oxford.[2]
He succeeded his father in the earldom in 1867 and took his seat on the Liberal benches in the House of Lords. The following year he was appointed a Lord-in-waiting (government whip in the House of Lords) in William Ewart Gladstone's first administration, a post he held until 1870, and then served as a Civil Lord of the Admiralty from 1870 to 1874.
Lord Camperdown received an honorary doctorate (LL.D.) from the University of St Andrews in February 1902.[3] The previous year he had become President of University College, Dundee, then a college of St Andrews. He remained president of the college until his death.[4]
Lord Camperdown died in June 1918, aged 77. He never married and was succeeded in the earldom by his younger brother George.[5]