English politician, poet, and man of letters.

While at Trinity College, Cambridge (1827–30), Milnes joined the socially and artistically progressive Apostles Club, which included among its members the poets Alfred Tennyson (Tennyson, Alfred Tennyson, 1st Baron) and Arthur Henry Hallam. From 1837 to 1863 he served as a member of Parliament (initially as a Tory, then as a Liberal from 1846), becoming involved in such questions as copyright and the establishment of juvenile reformatories. He was made a peer in 1863.

The lucidly Wordsworthian reflective poetry in Milnes's early volumes of verse—Memorials of a Tour in Some Parts of Greece (1834), Memorials of a Residence on the Continent and Historical Poems (1838), Poems of Many Years (1840), Poetry for the People (1840), and Palm Leaves (1844)—led many people to regard him as one of the most promising writers of his generation. But Milnes came to be known chiefly as a generous and discriminating patron of writers. He published the pioneering Life, Letters, and Literary Remains of John Keats (1848), secured a pension for Tennyson, made the American sage Ralph Waldo Emerson known in England, and was an early champion of the poet Algernon Charles Swinburne. He also formed a large library of erotic books that included the first serious collection of the works of the Marquis de Sade.