| Date: | 27 December 1990 – 4 January 1991 |
| Edition: | III |
| Surface: | Hard indoor |
| Location: | Perth, Western Australia |
| Venue: | Burswood Entertainment Complex |
The 1991 Hopman Cup was the third edition of the Hopman Cup, an international mixed teams tournament played at the Burswood Entertainment Complex in Perth, Western Australia. The event was held from 27 December 1990 through 4 January 1991.
Twelve teams competed in the tournament with the top four seeded teams (United States, Spain, Switzerland and the Soviet Union) each receiving a bye into the quarter-finals. The remaining eight teams played in the first round. In the final which was played on 4 January, Yugoslav pair, Goran Prpić and Monica Seles won both of their singles matches to defeat the American pair, Zina Garrison and David Wheaton without needing to go with the mixed doubles (which was also won by Yugoslavia).
The opening match of the 1991 Hopman Cup featured local Elizabeth Smylie and Pat Cash taking on Great Britain pair in Sarah Loosemore and Jeremy Bates. Despite losing the opening tie in straight sets, Australia qualified through to the quarter-finals in the mixed doubles.[1]