Mariner Books Classics is the literary classics imprint of Mariner Books, the trade paperback line originally founded by Houghton Mifflin and now part of HarperCollins following the 2021 sale of HMH's trade division. Mariner Books Classics reissues canonical literary works with new introductions and supporting apparatus for the modern reader, including Henry David Thoreau, Ralph Waldo Emerson, Henry Wadsworth Longfellow, and Mark Twain titles in the Mariner Books backlist.