Ballantine Books is a major American book publisher that is a subsidiary of German media conglomerate Bertelsmann. Ballantine was founded in 1952 by Ian Ballantine with his wife, Betty Ballantine. Ballantine was acquired by Random House in 1973, which in turn was acquired by Bertelsmann in 1998 and remains part of that company.

Ian Keith Ballantine was an American publisher who founded and published the paperback line of Ballantine Books from 1952 to 1974 with his wife, Betty Ballantine. The Ballantines were both inducted by the Science Fiction Hall of Fame in 2008, with a shared citation.