Jonathan Weiner (born November 26, 1953) is an American writer of nonfiction books based on his biological observations, focusing particularly on evolution in the Galápagos Islands, genetics, and the environment.

His latest book is Long for This World: The Strange Science of Immortality (Ecco Press, July 2010) a look at the scientific search for the Fountain of Youth.

Weiner was born November 26, 1953, to a Jewish family in New York City, the son of Ponnie (née Mensch) and Jerome Harris Weiner, an engineer and mathematician.

In 1982, he married Deborah Heiligman in a Jewish ceremony in Allentown, Pennsylvania.

Deborah Heiligman's book about Emma Darwin and her relationship with Charles, Charles and Emma: The Darwins' Leap of Faith (Henry Holt, January 2009)—"for Middle Readers and Young Adults"—won the inaugural YALSA Award for Excellence in Nonfiction for Young Adults from the American young-adult librarians, as the year's best nonfiction book.