Air Vice Marshal Harjinder Singh, PVSM, MBE (4 February 1909 – 6 September 1971) was an Air Officer in the Indian Air Force. He was one of the earliest to join the newly created Indian Air Force (IAF) in 1933 in the lowest rank of 'Hawai sepoy'. In a career spanning over three decades and two wars, he rose from the lowest enlisted rank to the then second-highest rank in the Indian Air Force. Hailed as technical wizard and innovator, he is considered a legend of the IAF.