1. O'Brien, Robert J. (1936-), author of The Stasi Report.
2. O'Brien, Robert (1963-), professor at McMaster University, author of The Global Political Economy.
3. O'Brien, Robert (1911-2004), journalist and editor at Reader's Digest & Time-Life Books, author of California Called Them.
4. O'Brien, Robert Alfred (1932-), author of Encyclopedia of the South.
5. O'Brien, Robert R., author of children's early readers.
6. O'Brien, Robert, journalist and editor of Baptist Press News.
