Miss USA 1966 was the 15th Miss USA pageant, televised live from Miami Beach, Florida, on May 21, 1966. Maria Remenyi of California won and was crowned by outgoing titleholder Sue Downey of Ohio. Idaho and South Dakota did not send delegates, making this the last Miss USA in which not all states were represented; the only later telecast with fewer than 51 delegates (1981) resulted from a disqualification.