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. He launched the career of the late Pakistani singer Nazia Hassan, and produced Indipop hits for a number of Indian acts, notably Alisha Chinai. From the mid-1970s, Biddu has also been producing his own pop instrumental albums as Biddu Orchestra.
Biddu is still active in the Indian and western music scene, producing albums which are more spiritual and eastern-oriented.