Miss USA 1966 was the 15th Miss USA pageant, televised live from Miami Beach, Florida, on May 21, 1966.

Idaho and South Dakota did not send a delegate in 1966, making this the last Miss USA pageant in which not all states were represented The only subsequent pageant with fewer than 51 delegates in the live telecast – 1981 – resulted from a state representative being disqualified during the preliminary judging.