Miss Universe 1966 was the 15th Miss Universe pageant, held on 16 July 1966 at the Miami Beach Auditorium in Miami Beach, Florida, United States. Apasra Hongsakula of Thailand crowned her successor Margareta Arvidsson of Sweden at the end of the event.

Margareta Arvidsson is a Swedish actress, fashion model and beauty queen who was crowned as the 1966 Miss Universe at age 18. She represented Vänersborg in the 1966 Miss Sweden Pageant. She was the second Swedish to win the crown, 11 years after Hillevi Rombin.