See main article: 2009 East Asian Games.
Swimming at the 5th East Asian Games was held 6–10 December 2009 in Kowloon, Hong Kong.[1] The competition featured 40 long course (50m) events: 20 for males, 20 for females.
7 nations had swimmers in the 2009 East Asian Games:
| 50m Freestyle | CAI Li  China | 22.56 GR | LU Zhiwu China | 22.58 | PARK Min-Kyu  South Korea | 22.77 | |
| 100m Freestyle | Takuro Fujii  Japan | 48.76 | Yoshihiro Okumura Japan | 49.16 | LU Zhiwu China | 49.96 | |
| 200m Freestyle | Yoshihiro Okumura Japan | 1:46.37 GR | Sho Uchida Japan | 1:46.87 | ZHANG Lin China | 1:49.59 | |
| 400m Freestyle | SUN Yang China | 3:46.16 GR | Sho Uchida Japan | 3:51.36 | JANG Sang-Jin South Korea | 3:51.91 | |
| 800m Freestyle | Yohsuke Miyamoto Japan | 7:59.85 GR | LI Yunqi China | 8:01.30 | KANG Yong-Hwan South Korea | 8:01.45 | |
| 1500m Freestyle | SUN Yang China | 14:58.35 GR | Yohsuke Miyamoto Japan | 15:15.55 | KANG Yong-Hwan South Korea | 15:41.53 | |
| 50m Backstroke | Ryosuke Irie Japan | 25.07 GR | CHENG Feiyi China | 25.62 | JEONG Doo-Hee South Korea | 26.10 | |
| 100m Backstroke | Ryosuke Irie Japan | 52.76 GR | PARK Seon-Kwan South Korea | 54.66 | HE Jianbin China | 55.61 | |
| 200m Backstroke | Ryosuke Irie Japan | 1:53.73 GR | PARK Seon-Kwan South Korea | 1:59.89 | ZHANG Yu China | 2:01.56 | |
| 50m Breaststroke | Ryo Tateishi Japan | 27.84 | Yuki Honda Japan | 28.04 | WANG Shuai China | 28.14 | |
| 100m Breaststroke | Ryo Tateishi Japan | 1:00.06 GR | CHOI Kyu-Woong South Korea | 1:01.00 | WANG Shuai China | 1:01.33 | |
| 200m Breaststroke | Ryo Tateishi Japan | 2:09.59 GR | Ryohsuke Shimada Japan | 2:11.81 | CHOI Kyu-Woong South Korea | 2:11.87 | |
| 50m Butterfly | Kohei Kawamoto Japan | 23.60 GR | ZHOU Jiawei China | 23.83 | SHI Feng China | 23.99 | |
| 100m Butterfly | Takuro Fujii Japan | 51.51 GR | Kohei Kawamoto Japan | 51.54 | ZHOU Jiawei China | 52.04 | |
| 200m Butterfly | Ryusuke Sakata Japan | 1:55.23 GR | WU Peng China | 1:56.32 | HSU Chi-Chieh Chinese Taipei | 1:56.54 | |
| 200m I.M. | Yosuke Mori Japan | 1:58.82 GR | Yuma Kosaka Japan | 1:59.74 | KIM Min-Gyu South Korea | 2:00.41 | |
| 400m I.M. | Yuya Horihata Japan | 4:14.89 GR | KIM Min-Gyu South Korea | 4:15.27 | Yosuke Mori Japan | 4:15.54 | |
| 4 × 100 m Freestyle Relay | Takuro Fujii, GR Yoshihiro Okumura, Hiroaki Yamamoto, Sho Uchida | 3:14.73 GR | LU Zhiwu, SHI Tengfei, CHEN Zuo, CAI Li | 3:17.43 | LUM Ching Tat, NG Chun Nam, CHEUNG Kin Tat, WONG Kai Wai | 3:21.22 | |
| 4 × 200 m Freestyle Relay | Sho Uchida, GR Shunsuke Kuzuhara, Hiroaki Yamamoto, Yoshihiro Okumura | 7:10.16 GR | ZHANG Lin, LI Yunqi, SHI Tengfei, SUN Yang | 7:20.21 | JANG Sang-Jin, BAE Joon-Mo, KANG Yong-Hwan, PARK Min-Kyu | 7:25.05 | |
| 4 × 100 m Medley Relay | Ryosuke Irie, Ryo Tateishi, Kohei Kawamoto, Takuro Fujii | 3:31.71 GR | HE Jianbin, WANG Shuai, ZHOU Jiawei, LU Zhiwu | 3:37.00 | PARK Seon-Kwan, CHOI Kyu-Woong, JEONG Doo-Hee, PARK Min-Kyu | 3:37.43 | |
| 50m Freestyle | LI Zhesi China | 24.68 GR | TANG Yi China | 25.49 | Hannah Wilson  Hong Kong | 25.70 | |
| 100m Freestyle | LI Zhesi China | 54.24 GR | TANG Yi China | 54.82 | Hannah Wilson Hong Kong | 55.13 | |
| 200m Freestyle | LIU Jing China | 1:59.55 | Misaki Yamaguchi Japan | 2:00.70 | AU Hoi Shun Hong Kong | 2:01.67 | |
| 400m Freestyle | WANG Xinyu China | 4:11.84 | Kazuki Wakanami Japan | 4:13.62 | AU Hoi Shun Hong Kong | 4:14.58 | |
| 800m Freestyle | WANG Xinyu China | 8:37.88 | Kazuki Wakanami Japan | 8:42.26 | Natsumi Iwashita Japan | 8:47.23 | |
| 1500m Freestyle | Natsumi Iwashita Japan | 16:36.84 | Natasha Tang Hong Kong | 16:53.36 | Carmen Nam Hong Kong | 17:36.88 | |
| 50m Backstroke | GAO Chang China | 27.43 GR | ZHAO Jing China | 27.45 | Miyuki Takemura Japan | 28.48 | |
| 100m Backstroke | GAO Chang China | 59.77 GR | ZHAO Jing China | 59.97 | Miyuki Takemura Japan | 1:00.86 | |
| 200m Backstroke | Tomoyo Fukuda Japan | 2:09.30 GR | BAI Anqi China | 2:09.54 | Miyuki Takemura Japan | 2:12.15 | |
| 50m Breaststroke | CHEN Huijia China | 30.46 GR | WANG Randi China | 30.64 | Satomi Suzuki Japan | 31.63 | |
| 100m Breaststroke | CHEN Huijia China | 1:05.64 GR | WANG Randi China | 1:07.30 | Satomi Suzuki Japan | 1:07.98 | |
| 200m Breaststroke | SUN Ye China | 2:22.59 GR | JEONG Da-Rae South Korea | 2:24.90 | JUNG Seul-Ki South Korea | 2:25.10 | |
| 50m Butterfly | JIAO Liuyang China | 25.91 GR | Misaki Ago Japan | 26.64 | HONG Wenwen China | 26.65 | |
| 100m Butterfly | JIAO Liuyang China | 57.28 GR | GUO Fan China | 57.88 | Hannah Wilson Hong Kong | 58.85 | |
| 200m Butterfly | LIU Zige China | 2:04.65 GR | JIAO Liuyang China | 2:06.07 | Yuko Nakanishi Japan | 2:09.32 | |
| 200m I.M. | LIU Jing China | 2:12.10 GR | Tomoyo Fukuda Japan | 2:12.15 | KIM Seo-Yeong South Korea | 2:13.65 | |
| 400m I.M. | CHENG Wan-Jung Chinese Taipei | 4:40.21 GR | LIU Jing China | 4:40.34 | ZHENG Rongrong China | 4:41.11 | |
| 4 × 100 m Freestyle Relay | TANG Yi, ZHENG Rongrong, ZHANG Jiaqi, LI Zhesi | 3:39.75 GR | Hannah Wilson, TSAI Hiu Wai, AU Hoi Shun, SZE Hang Yu | 3:40.80 | Natsuki Hasegawa, An Yumoto, Akane Hoshi, Misaki Yamaguchi | 3:42.55 | |
| 4 × 200 m Freestyle Relay | WANG Xinyu, TANG Yi, HA Sinan, LIU Jing | 8:01.14 GR | SZE Hang Yu, Hannah Wilson, KONG Man-Yi, AU Hoi Shun | 8:04.86 | KIM Jung-Hye, PARK Na-Ri, KIM Seo-Yeong, LEE Jae-Young | 8:07.73 | |
| 4 × 100 m Medley Relay | CAO Chang, WANG Randi, JIAO Liuyang, YU Yao | 3:58.51 GR | Miyuki Takemura, Satomi Suzuki, Yuko Nakanishi, Misaki Yamaguchi | 4:02.60 | TSAI Hiu Wai, KONG Man-Yi, SZE Hang Yu, Hannah Wilson | 4:03.07 | |