| Score: | 4–6, 6–3, 6–3 |
| Draw: | 80 (5) |
| Seeds: | 4 |
| After Name: | Wimbledon Championships – Mixed doubles |
| Before Name: | Wimbledon Championships – Mixed doubles |
| Type: | grand slam |
See main article: 1966 Wimbledon Championships. Ken Fletcher and Margaret Smith successfully defended their title, defeating Dennis Ralston and Billie Jean King in the final, 4–6, 6–3, 6–3 to win the mixed doubles tennis title at the 1966 Wimbledon Championships.[1]
See also: 1 and 1. 
Ken Fletcher / Margaret Smith (champions)
See also: 2. n/a
See also: 3 and 6. 
Dennis Ralston / Billie Jean King (final)
See also: 4 and 3. Fred Stolle / 
Françoise Dürr (semifinals)