| Event: | Swimming |
| Games: | 1998 Asian Games |
| Venue: | Thammasat Aquatic Center |
| Dates: | 7–12 December 1998 |
| Prev: | 1994 |
| Next: | 2002 |
Swimming was contested from December 7 to December 19 at the 1998 Asian Games in Bangkok, Thailand.
| 50 m freestyle | 22.38 | 23.26 | 23.43 | ||||
| 100 m freestyle | 51.29 | 52.07 | 52.21 | ||||
| 200 m freestyle | 1:52.46 | 1:52.53 | 1:52.81 | ||||
| 400 m freestyle | 3:53.61 | 3:54.13 | 4:00.44 | ||||
| 1500 m freestyle | 15:22.20 | 15:40.17 | 15:51.60 | ||||
| 100 m backstroke | 55.53 | 56.40 | 56.83 | ||||
| 200 m backstroke | 1:59.30 | 2:00.94 | 2:01.80 | ||||
| 100 m breaststroke | 1:02.32 | 1:02.55 | 1:03.09 | ||||
| 200 m breaststroke | 2:16.26 | 2:16.47 | 2:16.97 | ||||
| 100 m butterfly | 53.34 | 54.40 | 54.83 | ||||
| 200 m butterfly | 1:56.75 | 1:59.67 | 2:00.46 | ||||
| 200 m individual medley | 2:03.34 | 2:04.94 | 2:05.45 | ||||
| 400 m individual medley | 4:20.98 | 4:22.57 | 4:24.15 | ||||
| 4 × 100 m freestyle relay | Hirosuke Hamano Shunsuke Ito Tomohiro Yamanoi Shusuke Ito | 3:25.53 | Wang Chuan Deng Qingsong Zhang Qiang Zhao Lifeng | 3:25.86 | Igor Sitnikov Sergey Borisenko Pavel Sidorov Andrey Kvassov | 3:28.53 | |
| 4 × 200 m freestyle relay | Yosuke Ichikawa Shusuke Ito Shunsuke Ito Hideaki Hara | 7:30.53 | Wang Chuan Du Jie Xiong Guoming Deng Qingsong | 7:34.11 | Kim Bang-hyun Woo Chul Koh Yun-ho Han Kyu-chul | 7:36.07 | |
| 4 × 100 m medley relay | Atsushi Nishikori Akira Hayashi Takashi Yamamoto Shunsuke Ito | 3:41.98 | Fu Yong Zeng Qiliang Zhang Xiao Deng Qingsong | 3:44.40 | Pavel Sidorov Alexandr Savitskiy Andrey Gavrilov Igor Sitnikov | 3:51.13 |
| 50 m freestyle | 25.88 | 26.04 | 26.08 | ||||
| 100 m freestyle | 56.20 | 56.39 | Shared silver | ||||
| 200 m freestyle | 2:00.89 | 2:01.75 | 2:03.14 | ||||
| 400 m freestyle | 4:12.31 | 4:14.53 | 4:15.66 | ||||
| 800 m freestyle | 8:38.00 | 8:39.21 | 8:56.90 | ||||
| 100 m backstroke | 1:01.84 | 1:02.11 | 1:03.37 | ||||
| 200 m backstroke | 2:12.25 | 2:14.79 | 2:16.46 | ||||
| 100 m breaststroke | 1:08.95 | 1:10.00 | 1:10.30 | ||||
| 200 m breaststroke | 2:28.44 | 2:28.71 | 2:32.39 | ||||
| 100 m butterfly | 59.44 | 1:00.57 | 1:00.87 | ||||
| 200 m butterfly | 2:11.34 | 2:12.51 | 2:13.26 | ||||
| 200 m individual medley | 2:15.12 | 2:15.54 | 2:15.95 | ||||
| 400 m individual medley | 4:39.92 | 4:46.74 | 4:47.34 | ||||
| 4 × 100 m freestyle relay | Shan Ying Qian Min Han Xue Chao Na | 3:45.51 | Kaori Yamada Ayari Aoyama Sumika Minamoto Junko Nakatani | 3:47.65 | Tsai Shu-min Chiang Tzu-ying Lin Chi-chan Lin Meng-chieh | 3:51.42 | |
| 4 × 200 m freestyle relay | Chen Hua Yang Lina Qian Min Qin Caini | 8:08.00 | Eri Yamanoi Yasuko Tajima Sachiko Yamada Junko Nakatani | 8:12.06 | Tsai Shu-min Kuan Chia-hsien Lin Chi-chan Chiang Tzu-ying | 8:18.92 | |
| 4 × 100 m medley relay | Tomoko Hagiwara Masami Tanaka Ayari Aoyama Sumika Minamoto | 4:06.70 | Wu Yanyan Li Wei Ruan Yi Shan Ying | 4:08.54 | Shim Min-ji Kye Yoon-hee Cho Hee-yeon Lee Bo-eun | 4:15.03 |