| Ernest Edgcumbe, 3rd Earl of Mount Edgcumbe | |
| Office1: | Member of Parliament for Plympton Erle |
| Term1: | 1830 |
| Office2: | Member of Parliament for Lostwithiel |
| Term2: | 1826–1830 |
| Office3: | Member of Parliament for Fowey |
| Term3: | 1819–1826 |
| Birth Date: | 23 March 1797 |
| Children: | William Edgcumbe |
| Father: | Richard Edgcumbe |
| Relatives: | George Edgcumbe (grandfather) William Edgcumbe (brother) Emma Cust (sister) George Edgcumbe (brother) |
Ernest Augustus Edgcumbe, 3rd Earl of Mount Edgcumbe (23 March 1797 – 3 September 1861), styled Viscount Valletort between 1818 and 1837, was a British peer and politician.
Mount Edgcumbe was the second but eldest surviving son of Richard Edgcumbe, 2nd Earl of Mount Edgcumbe, and Lady Sophia, daughter of John Hobart, 2nd Earl of Buckinghamshire. He gained the courtesy title Viscount Valletort on the death of his elder brother, William Edgcumbe, Viscount Valletort, in 1818.
Mount Edgcumbe was returned to Parliament for Fowey in 1819 (succeeding his deceased elder brother Lord Valletort), a seat he held until 1826,[1] and then represented Lostwithiel until 1830.[2] In 1837 he succeeded his father in the earldom and entered the House of Lords.
Lord Mount Edgcumbe married Caroline Augusta, daughter of Rear-Admiral Charles Feilding, in 1831. She was a half-sister of Henry Fox Talbot. He died in September 1861, aged 64, and was succeeded in the earldom by his son, William. Lady Mount Edgcumbe survived him by 20 years and died in November 1881.