Biddu or Biddu Appaiah (born 1943 or 1944) is an Indian-British music producer, composer and song-writer who produced and composed a number of hit records during the early part of the British Disco scene of the mid-1970s.

He lifted the careers of British Disco music stars Tina Charles, Carl Douglas, Jimmy James among others; and later found success producing several hits on the Indian subcontinent. From the mid-1970s, Biddu has also been producing his own pop instrumental albums as Biddu Orchestra.