Ralph William Grey (1819, Earsdon, Northumberland – 1 October 1869, Kingston upon Thames, Surrey) was a British Whig politician. He was the son of Ralph William Grey (died 1822) of Backworth House, Northumberland, and his wife Ann, daughter of Rev. Sir Samuel Jervoise, 1st Baronet, and was educated at Eton College. He matriculated at Trinity College, Cambridge in 1836, graduating B.A. in 1840. In 1839 he became private secretary to Charles Poulett Thomson, shortly to become Baron Sydenham and the first Governor General of Canada.