American journalist, critic, anthologist, and editor who worked with Edgar Allan Poe (Poe, Edgar Allan) on Graham's Magazine and succeeded him as assistant editor (1842–43).

Griswold traveled extensively in his youth, worked in newspaper offices, was a Baptist clergyman for a time, and finally became a journalist in New York City, where he was successively a member of the staffs of The Brother Jonathan, The New World (1839–40), The New Yorker (1840), Graham's Magazine (1841–43), and International Magazine (1850–52), which in 1852 merged into Harper's Magazine.

Poe named Griswold his literary executor, a tribute that Griswold repaid by what proved to be numerous slanders and misrepresentations. Nevertheless, he did edit, with James R. Lowell and N.P. Willis, the works (1850) of Poe. He also edited the first U.S. edition of John Milton's prose (1845) and compiled a number of anthologies of American writing. His best work is The Republican Court, or American Society in the Days of Washington (1855). His books were noted for personality sketches of contemporary writers.