George Ralph Campbell Abercromby, 4th Baron Abercromby DL JP (23 September 1838 – 30 October 1917), styled The Honourable from 1843 to 1852, was a Scottish peer and politician.

Abercromby was born in Leamington, Warwickshire on 23 September 1838. He was the oldest son of George Abercromby, 3rd Baron Abercromby.^[1] His mother Louisa Penuel Forbes was the daughter of the judge John Forbes, Lord Medwyn and sister of the clergyman Alexander Penrose Forbes.^[1]

Abercromby succeeded his father as baron in 1852 and joined the House of Lords.^[1] He was justice of the peace for Clackmannanshire and Stirlingshire and was nominated a deputy lieutenant for the latter county in 1860.^[1]

Abercromby married Lady Julia Janet Georgiana Duncan (b. 1840), the daughter of Adam Haldane-Duncan, 2nd Earl of Camperdown and his wife Juliana Cavendish Philips, at the earl's residence Camperdown House on 6 October 1858. The marriage produced no children.

Lady Abercromby served Queen Victoria as a Lady of the Bedchamber 1874–1885. She died in 1915.^[2]

Abercromby survived her for two years, he died in Kensington area of London aged 79. He was succeeded in the barony by his younger brother John.