Miss USA 1984 was the 33rd Miss USA pageant, held at the Lakeland Civic Auditorium in Lakeland, Florida, on May 17, 1984. Mai Shanley of New Mexico was crowned Miss USA 1984 by outgoing titleholder Julie Hayek of California. Bob Barker hosted the live telecast. It was the first time the pageant had been held in Florida since 1971.