| Date: | August 27, 1966 |
| Venue: | Ohio State Fairgrounds, Columbus, Ohio |
| Presenters: | Bob Hope |
| Entrants: | 49 |
| Placements: | 7 |
| Winner: | Denice Estelle Blair Utah |
| Congeniality: | Bettye Jean Dillon Tennessee |
| Before: | 1965 |
| Next: | 1967 |
Miss USA World 1966 was the 5th edition of the Miss USA World pageant and it was held at the Ohio State Fairgrounds in Columbus, Ohio and was won by Denice Estelle Blair of Utah. She was crowned by outgoing titleholder, Dianna Lynn Batts of the District of Columbia. Blair went on to represent the United States at the Miss World 1966 Pageant in London later that year. She finished as 6th Runner-Up at Miss World.[1]
This year was also significant as, this was the last year that the pageant was called Miss USA World. From 1967 onward, the pageant would be called Miss World USA until 1978.
| Final results | Contestant |
|---|---|
| Miss USA World 1966 |
|
| 1st Runner-Up |
|
| 2nd Runner-Up |
|
| 3rd Runner-Up |
|
| |
| Top 7 |
|
| Award | Contestant |
|---|---|
| Miss Congeniality |
|
The Miss USA World 1966 delegates were:
Contestants who competed in other beauty pageants:
: Johneane Teeter
: Jane Nelson (1st Runner-Up; as )
: Denice Estelle Blair (Top 15)
: Jane Nelson (Top 10)