Dan Guenther (born 1944 in Waukegan, Illinois), is an American novelist and poet. A graduate of Coe College, he has a Master of Fine Arts from the Iowa Writers' Workshop. He was a captain in the U.S. Marine Corps. His poems and letters from Vietnam, during the Vietnam War, were included in the acclaimed novel, The Stones of Summer by Dow Mossman, published by Bobbs-Merrill in 1972 and republished by Barnes & Noble in 2003. In 2002, Guenther appeared in the documentary film Stone Reader by Mark Moskowitz. The film chronicled the director's attempt to revive and have republished the acclaimed book of seemingly vanished author Dow Mossman, a lifelong friend of Dan Guenther. The revival was successful.