The aquatics events at the 2007 SEA Games included swimming, diving and water polo. The events were held at the Aquatic Center, His Majesty the King's 80th Birthday Anniversary Stadium, Nakhon Ratchasima, Thailand.
The Swimming competition was held from 7 to 11 December and featured 32 events.
9 countries competed (team size is number behind country):
Note: There was no participation from Brunei Darussalam and Timor Leste.
| 50 m freestyle | 22.80 | 23.24 | 23.51 | ||||
| 100 m freestyle | 51.23 | 51.53 | 52.16 | ||||
| 200 m freestyle | 1:52.32 | 1:52.98 | 1:53.59 | ||||
| 400 m freestyle | 3:59.08 | 3:59.61 | 3:59.81 | ||||
| 1500 m freestyle | 15:53.16 | 15:58.92 | 16:07.99 | ||||
| 100 m backstroke | 59.46 | 59.56 | 59.60 | ||||
| 200 m backstroke | 2:05.82 | 2:08.17 | 2:09.32 | ||||
| 100 m breaststroke | 1:03.73 | 1:03.95 | 1:04.66 | ||||
| 200 m breaststroke | 2:18.11 | 2:20.87 | 2:21.32 | ||||
| 100 m butterfly | 54.33 | 55.47 | 55.59 | ||||
| 200 m butterfly | 2:00.45 | 2:00.81 | 2:03.97 | ||||
| 200 m individual medley | 2:05.50 | 2:09.12 | 2:09.25 | ||||
| 400 m individual medley | 4:28.85 | 4:28.91 | 4:40.42 | ||||
| 4 × 100 m freestyle relay | 3:26.70 | 3:27.70 | Kunanon Kittipute Radomyos Matjiur Thanyanant Phadungkiatwatana Suriya Suksuphak | 3:32.59 | |||
| 4 × 200 m freestyle relay | Marcus Cheah Ming Zhe Joshua Lim Wen Hao Bryan Tay Zhi Rong Thum Bing Ming | 7:38.62 | Kunanon Kittipute Radomyos Matjiur Thanyanant Phadungkiatwatana Tharnawat Thanakornworakiart | 7:43.26 | Eric Chang Daniel Bego Kevin Lim Kevin Yeap Soon Choy | 7:43.28 | |
| 4 × 100 m medley relay | 3:49.28 | 3:51.72 | 3:52.14 | ||||
| 50 m freestyle | 26.63 | 26.79 | 26.80 | ||||
| 100 m freestyle | 57.55 | 58.14 | 58.45 | ||||
| 200 m freestyle | 2:03.00 | 2:03.55 | 2:05.75 | ||||
| 400 m freestyle | 4:18.20 | 4:20.01 | 4:22.55 | ||||
| 800 m freestyle | 8:47.80 | 8:56.19 | 9:00.43 | ||||
| 100 m backstroke | 1:04.05 | 1:04.74 | 1:06.03 | ||||
| 200 m backstroke | 2:17.39 | 2:20.84 | 2:21.43 | ||||
| 100 m breaststroke | 1:10.15 | 1:12.65 | 1:13.57 | ||||
| 200 m breaststroke | 2:31.96 | 2:32.55 | 2:39.16 | ||||
| 100 m butterfly | 1:00.33 | 1:02.08 | 1:02.25 | ||||
| 200 m butterfly | 2:15.63 | 2:16.79 | 2:20.71 | ||||
| 200 m individual medley | 2:18.52 | 2:20.80 | 2:21.22 | ||||
| 400 m individual medley | 4:53.90 | 4:54.11 | 4:55.86 | ||||
| 4 × 100 m freestyle relay | Natthanan Junkrajang Pannika Prachgosin Jiratida Yosophon Pilin Tachakittiranan | 3:51.86 | Heidi Gan Khoo Cai Lin Leung Chii Lin Siow Yi Ting | 3:54.91 | Erica Totten Maria Georgina Gandionco Jaclyn Pangilinan Nicole Santiago | 4:01.72 | |
| 4 × 200 m freestyle relay | Natthanan Junkrajang Jiratida Yosophon Rutai Vatana Pilin Tachakittiranan | 8:20.77 | Lynette Lim Shu-En Amanda Lim Xiang Qi Quah Ting Wen Mylene Ong Chui Bin | 8:26.23 | Heidi Gan Khoo Cai Lin Lew Yih Wey Ong Ming Xiu | 8:27.13 | |
| 4 × 100 m medley relay | 4:13.18 | 4:19.33 | Wenika Kaewchaiwong Natthanan Junkrajang Natnapa Prommuenwai Phantira Saraikarn | 4:25.00 | |||
The diving events at the 2007 Southeast Asian Games took place at the His Majesty The King's 80th Anniv. Swimming Pool. It was held from 12 December to 15 December 2007. Ten gold medals were contested.
There was no participation from Brunei, Cambodia, Laos, Singapore, and Timor Leste.
| 1 m springboard | 416.05 | 380.85 | 361.50 | ||||
| 3 m springboard | 444.05 | 435.65 | 407.40 | ||||
| 10 m platform | 429.70 | 419.90 | 401.10 | ||||
| Synchronized 3 m springboard | Yeoh Ken Nee Rossharisham Roslan | 416.76 | Zardo Domenios Niño Carog | 366.42 | Vũ Anh Duy Nguyễn Minh Sang | 324.93 | |
| Synchronized 10 m platform | Rexel Ryan Fabriga Jaime Asok | 376.72 | Vũ Anh Duy Nguyễn Minh Sang | 365.04 | Mohamed Nasrullah Husaini Noor | 357.96 |
| 1 m springboard | 278.30 | 265.80 | 263.10 | ||||
| 3 m springboard | 316.60 | 306.90 | 300.80 | ||||
| 10 m platform | 345.30 | 308.85 | 300.25 | ||||
| Synchronized 3 m springboard | 281.28 | Hoàng Thanh Trà Nguyễn Hoài Anh | 260.31 | 256.02 | |||
| Synchronized 10 m platform | 293.79 | Shenny Ratna Amelia Herlyani Sukmahati | 270.12 | Sukrutai Tommaoros Dangjai Putsadee | 208.17 |
The Water polo events was held from 7 December to 11 December 2007. Six teams were in competition in a round-robin format, with defending champion Singapore retaining its title which it has won 22 times consecutively since 1965, inclusive of the current games.
There was no participation from Brunei Darussalam, Cambodia, Laos, Myanmar and Timor Leste.