Ralph Weymouth (May 26, 1917 – January 22, 2020) was a decorated Vice Admiral of the United States Navy and anti-nuclear campaigner. Weymouth was born in Seattle to Ralph Wells Weymouth and his wife Lisbeth Cunningham Sewall. He graduated from the U.S. Naval Academy in 1938, served two years on surface ships, began naval aviator training, and earned his wings in 1941. During service in post-war Japan, Weymouth became concerned at the effects of nuclear war on the inhabitants of Nagasaki and Hiroshima and became an opponent of nuclear weapons, becoming more active in retirement.