Geoffrey O'Brien (born 1948 New York City, New York) is an American poet, editor, book and film critic, translator, and cultural historian. In 1992, he joined the staff of the Library of America as executive editor, becoming editor-in-chief in 1998.
O'Brien was born in New York City and grew up in Great Neck, Long Island. His mother, Margaret O'Brien, née Owens, was a theater actress, and his father was Joseph O'Brien, one of the original WMCA Good Guys.
O'Brien began publishing poetry and criticism in the 1960s. He has been a contributor to Artforum, Film Comment, The New York Times and The New York Times Book Review, Village Voice, New Republic, Bookforum, and, especially, to the New York Review of Books. He has also been published in numerous other publications, including Filmmaker, American Heritage, The Armchair Detective, Bomb, Boston Globe, Fence, GQ, The Los Angeles Times Book Review, Men’s Vogue, Mother Jones, The Nation, Newsday, and Slate, and has contributed many essays for liner notes for The Criterion Collection. In addition, his work has been included in numerous anthologies.
He has served as editor of The Reader's Catalog (1987–1991), a faculty member of The Writing Program at The New School, a contributing editor at Open City, and was a member of the selection committee for The New York Film Festival in 2003.