List of Famous people named John

John P. Grotzinger is the Fletcher Jones Professor of Geology at California Institute of Technology and chair of the Division of Geological and Planetary Sciences. His works primarily focus on chemical and physical interactions between life and the environment. In addition to biogeological studies done on Earth, Grotzinger is also active in research into the geology of Mars and has made contributions to NASA's Mars Exploration Program.

John Peter Cleaver Shanks was a U.S. Representative from Indiana and an officer in the Union Army during the American Civil War.

John Marcus O'Sullivan was an Irish Fine Gael politician who served as Minister for Education from 1926 to 1932 and Parliamentary Secretary to the Minister for Finance from 1924 to 1926. He served as a Teachta Dála (TD) from 1923 to 1943.

John O'Brien was an American author. His first novel, Leaving Las Vegas, was published in 1990 by Watermark Press and made into a film of the same name in 1995.