Baj or BAJ may refer to:
People Baj Singh (died 1716), Sikh general Enrico Baj (1924–2003), Italian artist and art writer Stanisław Baj (born 1953), Polish painter Tommaso Baj (c. 1650–1714), Italian conductor, composer and tenor
BAJ Bachelor of Arts, Journalism Bridge Asia Japan, a non-governmental organisation Bank Aljazira, a Saudi Arabian financial group Belarusian Association of Journalists, a Belarusian non-governmental organisation Berliner Astronomisches Jahrbuch, an astronomical ephemeris almanac
Other uses Baj, Hungary, a village Baj Ganjo, a character created by Bulgarian author Aleko Konstantinov baj, ISO 639-3 code for the Barakai language, spoken on the Aru Islands of Indonesia
See also Bajs (disambiguation)