William Leonard Laurence (March 7, 1888 – March 19, 1977) was a Jewish Lithuanian-born American journalist known for his science journalism writing of the 1940s and 1950s while working for The New York Times. He won two Pulitzer Prizes and, as the official historian of the Manhattan Project, was the only journalist to witness the Trinity test and the atomic bombing of Nagasaki. He is credited with coining the iconic term "Atomic Age" which became popular in the 1950s.