George Rice-Trevor, 4th Baron Dynevor (5 August 1795 – 7 October 1869) was a British politician and peer.
He was the son of George Talbot Rice, 3rd Baron Dynevor. Dynevor matriculated at Christ Church, Oxford 13 October 1812; he was awarded a D.C.L. on 11 June 1834.
He served as Tory Member of Parliament (MP) for Carmarthenshire, from 1820 to 1831 and from 1832 to 1852. Lord Dynevor succeeded to the title of Baron Dynevor in 1852. He was an honorary colonel in the militia and from 1852 to 1869 he served as ADC to Queen Victoria.
On 27 November 1824 he married Frances Fitzroy, daughter of General Lord Charles Fitzroy (a younger son of Augustus FitzRoy, 3rd Duke of Grafton). The couple had the following children:
By royal licence, 28 October 1824, he took the name of Trevor, after that of Rice, on inheriting the estates of the Trevor family at Glynde, Sussex.
Dynevor died 7 October 1869, aged 74, at Malvern, Worcestershire. As he died without male issue, his cousin the Reverend Francis William Rice succeeded to the barony. The family wealth passed to his daughters, thus splitting the wealth from the title.