Marc Reisner (September 14, 1948 – July 21, 2000) was an American environmentalist and writer best known for his book Cadillac Desert, a history of water management in the American West.
He was born in Minneapolis, Minnesota, the son of a lawyer and a scriptwriter, and graduated from Earlham College in 1971. For a time he was on the staffs of Environmental Action and the Population Institute in Washington, D.C. Starting in 1972, he worked for seven years as a staff writer and director of communications for the Natural Resources Defense Council in New York. In 1979 he received an Alicia Patterson Journalism Fellowship, which enabled him to conduct research and write Cadillac Desert, which was first published in 1986. The book was a finalist for both the National Book Critics' Circle Award and the Bay Area Book Reviewers' Award (BABRA) that same year. In 1999, a Modern Library panel of authors and critics included it on a list of the 100 most notable English-language works of nonfiction of the 20th century. It was later made into a documentary film series that premiered nationwide on PBS nationwide in 1997 and won a Columbia University/Peabody Award.
He went on to write additional books and helped develop a PBS documentary on water management. He was featured as an interviewee in Stephen Ives's 1996 PBS documentary series The West, which was produced by Ken Burns. In 1997 he published a discussion paper for the American Farmland Trust on water policy and farmland protection. Shortly before he died, he had won a Pew Charitable Trusts Fellowship to support efforts to restore Pacific salmon habitat through dam removal.