John S. McCain

John S. McCain may refer to:

People

 * John S. McCain Sr. (1884–1945), United States Navy admiral
 * John S. McCain Jr. (1911–1981), United States Navy admiral and son of John S. McCain Sr.
 * John S. McCain III (1936–2018), United States Navy captain, American statesman, politician, and son of John S. McCain Jr.

Ships

 * USS John S. McCain, a U.S. Navy ship name
 * USS John S. McCain (DL-3), a Mitscher-class destroyer in the United States Navy from 1953 to 1978
 * USS John S. McCain (DDG-56), an Arleigh Burke-class destroyer in the United States Navy since 1994