The 1991 World Badminton Grand Prix was the ninth edition of the World Badminton Grand Prix finals. It was held in Kuala Lumpur, Malaysia, from December 11 to December 15, 1991.
| Category | Winners | Runners-up | Score |
|---|---|---|---|
| Men's singles | Zhao Jianhua | Wu Wenkai | 15–9, 5–15, 15–7 |
| Women's singles | Susi Susanti | Lee Heung-soon | 9–11, 11–8, 11–1 |
| Men's doubles | Jalani Sidek & Razif Sidek | Zheng Yumin & Hwang Zhanzhong | 15–10, 12–15, 18–15 |
| Women's doubles | Hwang Hye-young & Chung Myung-hee | Rosiana Tendean & Erma Sulistianingsih | 18–15, 15–3 |
| Mixed doubles | Thomas Lund & Pernille Dupont | Shou Jin-huan & Gil Young-ah | 11–15, 15–7, 15–9 |
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