Old Blue may refer to:
Old Blue, an alumnus of Christ's Hospital Old Blue, an alumnus of the University of California, Berkeley Old Blue (song), an old folk song, from which many variations have arisen Old Blue (rugby club), a Rugby Super League (US) team based in New York City The type of British passport issued before 1993 Old Blue (black robin), the last remaining fertile female that saved the black robin from extinction A conservation award given by Forest and Bird named after the black robin A traditional name for Yale University