| Aquatics at the 2005 SEA Games | |
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The aquatics events at the 2005 Southeast Asian Games included swimming, diving and water polo disciplines. All events were held in Trace College Aquatics Centre, Los Baños, Laguna, Philippines
Swimming
The Swimming competition was held 29 November to 4 December, and featured 32 events.
Medal table
* Host nation (Philippines)
| Rank | Nation | Gold | Silver | Bronze | Total | 
|---|---|---|---|---|---|
| 1 |  Singapore | 13 | 9 | 11 | 33 | 
| 2 |  Thailand | 6 | 9 | 8 | 23 | 
| 3 |  Philippines* | 4 | 5 | 6 | 15 | 
| 4 |  Indonesia | 4 | 5 | 3 | 12 | 
| 5 |  Malaysia | 4 | 3 | 1 | 8 | 
| 6 |  Vietnam | 1 | 0 | 0 | 1 | 
| 7 | .svg.png.webp) Myanmar | 0 | 1 | 3 | 4 | 
| Totals (7 entries) | 32 | 32 | 32 | 96 | |
Medalists
- Men
- Women
| Event | Gold | Silver | Bronze | |||
|---|---|---|---|---|---|---|
| 50 m freestyle | Joscelin Yeo  Singapore | 26.13 | Ho Shu Yong  Singapore | 26.61 | Moe Thu Aung .svg.png.webp) Myanmar | 26.66 | 
| 100 m freestyle | Joscelin Yeo  Singapore | 56.41 | Jiratida Phinyosophon  Thailand | 57.74 | Moe Thu Aung .svg.png.webp) Myanmar | 58.05 | 
| 200 m freestyle | Jiratida Phinyosophon  Thailand | 2:04.38 | Erica Totten  Philippines | 2:04.76 | Moe Thu Aung .svg.png.webp) Myanmar | 2:05.43 | 
| 400 m freestyle | Pilin Tachakittiranan  Thailand | 4:23.19 | Ong Ming Xiu  Malaysia | 4:23.76 | Quah Ting Wen  Singapore | 4:24.73 | 
| 800 m freestyle | Magdalena Sutanto  Indonesia | 8:59.13 | Quah Ting Wen  Singapore | 9:02.20 | Nimitta Thaveesupsoonthorn  Thailand | 9:03.34 | 
| 100 m backstroke | Tao Li  Singapore | 1:03.83 | Chui Lai Kwan  Malaysia | 1:05.27 | Chonlathorn Vorathamrong  Thailand | 1:06.56 | 
| 200 m backstroke | Tao Li  Singapore | 2:17.55 | Chonlathorn Vorathamrong  Thailand | 2:18.66 | Yuliana Malinda  Indonesia | 2:23.17 | 
| 100 m breaststroke | Joscelin Yeo  Singapore | 1:11.74 | Nicolette Teo  Singapore | 1:11.80 | Jaclyn Pangilinan  Philippines | 1:12.73 | 
| 200 m breaststroke | Nicolette Teo  Singapore | 2:34.56 | Jaclyn Pangilinan  Philippines | 2:35.58 | Jariyawadee Narongrit  Thailand | 2:38.31 | 
| 100 m butterfly | Joscelin Yeo  Singapore | 59.91 | Moe Thu Aung .svg.png.webp) Myanmar | 1:00.87 | Tao Li  Singapore | 1:01.53 | 
| 200 m butterfly | Tao Li  Singapore | 2:14.11 | Natnapa Prommuenwai  Thailand | 2:17.29 | Bernardette Lee  Singapore | 2:18.81 | 
| 200 m individual medley | Joscelin Yeo  Singapore | 2:19.23 | Nicolette Teo  Singapore | 2:22.86 | Nimitta Thaveesupsoonthorn  Thailand | 2:24.38 | 
| 400 m individual medley | Nimitta Thaveesupsoonthorn  Thailand | 4:57.92 | Bernardette Lee  Singapore | 5:00.27 | Quah Ting Wen  Singapore | 5:01.57 | 
| 4×100 m freestyle relay |  Thailand Natthanan Junkrajang Piyaporn Tantiniti Pannika Prachgosin Jiratida Phinyosophon | 3:52.70 |  Singapore Ho Shu Yong Joscelin Yeo Ruth Ho Lynette Ng | 3:55.53 |  Philippines Lizza Danila Heidi Gem Bianca Uy Erica Totten | 4:00.22 | 
| 4×200 m freestyle relay |  Thailand Natthanan Junkrajang Wenika Kaewchaiwong Jiratida Phinyosophon Pilin Tachakittiranan | 8:24.38 |  Singapore Ho Shu Yong Mylene Ong Quah Ting Wen Joscelin Yeo | 8:34.75 |  Philippines Marichi Gandionco Chrizel Lagunday Nichole Santiago Erica Totten | 8:38.38 | 
| 4×100 m medley relay |  Singapore Ho Shu Yong Tao Li Nicolette Teo Joscelin Yeo | 4:14.49 |  Philippines Lizza Danila Jaclyn Pangilinan Erica Totten Heidi Gem | 4:20.34 |  Thailand Jiratida Phinyosophon Pannika Prachgosin Piyaporn Tantiniti Natthanan Junkrajang | 4:21.39 | 
Diving
The diving events at the 2005 Southeast Asian Games took place in the Trace College Aquatic Centre in Los Baños, Laguna. It was held from November 27 to 30. Eight gold medals were contested in four disciplines.
Medal table
* Host nation (Philippines)
| Rank | Nation | Gold | Silver | Bronze | Total | 
|---|---|---|---|---|---|
| 1 |  Malaysia | 5 | 3 | 3 | 11 | 
| 2 |  Philippines* | 5 | 1 | 2 | 8 | 
| 3 |  Thailand | 0 | 3 | 4 | 7 | 
| 4 |  Vietnam | 0 | 2 | 0 | 2 | 
| 5 |  Indonesia | 0 | 1 | 1 | 2 | 
| Totals (5 entries) | 10 | 10 | 10 | 30 | |
Medalists
- Men
| Event | Gold | Silver | Bronze | |||
|---|---|---|---|---|---|---|
| 1 m springboard | Yeoh Ken Nee  Malaysia | 387.99 | Suchart Pichi  Thailand | 362.25 | Zardo Domenios  Philippines | 340.17 | 
| 3 m springboard | Yeoh Ken Nee  Malaysia | 676.41 | Suchart Pichi  Thailand | 658.92 | Zardo Domenios  Philippines | 635.64 | 
| 10 m platform | Bryan Nickson Lomas  Malaysia | 580.20 | Rexel Ryan Fabriga  Philippines | 566.61 | Sareerapat Pimsamsee  Thailand | 585.87 | 
| Synchronized 3 m springboard |  Philippines Zardo Domenios Niño Carog | 299.40 |  Malaysia Yeoh Ken Nee Rossharisham Roslan | 283.50 |  Thailand Meerit Insawang Suchart Pichi | 276.73 | 
| Synchronized 10 m platform |  Philippines Kevin Kromwel Kong Rexel Ryan Fabriga | 300.78 |  Malaysia Bryan Nickson Lomas James Sandayud | 299.94 |  Thailand Sareerapat Pimsamsee Suchart Pichi | 272.70 | 
- Women
| Event | Gold | Silver | Bronze | |||
|---|---|---|---|---|---|---|
| 1 m springboard | Sheila Mae Pérez  Philippines | 267.66 | Leong Mun Yee  Malaysia | 266.34 | Sari Ambarwati Suprihatin  Indonesia | 229.74 | 
| 3 m springboard | Sheila Mae Pérez  Philippines | 514.23 | Hoàng Thanh Trà  Vietnam | 461.46 | Leong Mun Yee  Malaysia | 456.64 | 
| 10 m platform | Leong Mun Yee  Malaysia | 472.86 | Shenny Ratna Amelia  Indonesia | 466.89 | Cheong Jun Hoong  Malaysia | 440.43 | 
| Synchronized 3 m springboard |  Philippines Sheila Mae Pérez Ceseil Domenios | 260.16 |  Thailand Sukrutai Tommaoros Supapan Prasertkwan | 239.40 |  Malaysia Cheong Jun Hoong Leong Mun Yee | 238.11 | 
| Synchronized 10 m platform |  Malaysia Leong Mun Yee Cheong Jun Hoong | 258.99 |  Vietnam Hoàng Thanh Trà Nguyễn Hoài Anh | 223.68 |  Thailand Sukrutai Tommaoros Neeranuch Chantrakulcholt | 214.20 | 
Water polo
The Water polo events were held from 21 November to 26 November 2005 at the Trace College, Los Baños, Laguna. Six teams were in competition in a round-robin format, with defending champion Singapore looking towards retaining its crown won 20 times consecutively since 1965. The team's win over Thailand on the fourth day of the tournament effectively meant it has worn the gold medal regardless of the score in its final match against Vietnam. The Philippines team managed to take the silver medal, equaling its best showing in the 1993 Southeast Asian Games.
Medalists
| Event | Gold | Silver | Bronze | 
|---|---|---|---|
| Men |  Singapore David Wee Ho Khai Weng Kenneth Wee Lee Kok Wang Alvin Lee Sai Meng Luo Nan Mallal Garret Charles Ng Eu Liem Marcus Ng Ker Wei Ronald Lam Tan Chin Tiong Tan Wei Keong Terence Yip Ren Kai |  Philippines Alan Cesar Payawal Sherwin Dela Paz Michael Jorolan Ricardo Dilap Dilap Norton Alamara Almax Laurel Frazier Alamara Teodoro Roy Cañete Ali Alamara Dale Evangelista Danny Dela Torre Monsuito Pelenio Tani Gomez |  Malaysia Loo Jih Sheng Albert Yeap Jin Teik Danny Ng Chin Han Teo Peng Jiew Wong Khar Munn Wong Khar Leon Jimmy Shim Wai Chong Lim How Jit Kee Zhen Hao Madhusudhan Varavindhakshan Abdul Hafiz Salleh Lai Cheng Loke Kee Dow Liang | 
Round-robin
Standings
| Team | Pld | W | D | L | GF | GA | Pts | 
|---|---|---|---|---|---|---|---|
| 1.  Singapore | 5 | 5 | 0 | 0 | 71 | 23 | 10 | 
| 2.  Philippines | 5 | 4 | 0 | 1 | 52 | 24 | 8 | 
| 3.  Malaysia | 5 | 2 | 0 | 3 | 24 | 46 | 4 | 
| 4.  Indonesia | 5 | 1 | 1 | 3 | 40 | 53 | 3 | 
| 5.  Thailand | 5 | 1 | 1 | 3 | 21 | 39 | 3 | 
| 6.  Vietnam | 5 | 1 | 0 | 4 | 32 | 55 | 2 | 
Results
| 21 November 2005 | ||
| Philippines | 15 – 10 | Indonesia | 
| Thailand | 7 – 5 | Vietnam | 
| Singapore | 21 – 3 | Malaysia | 
| 22 November 2005 | ||
| Indonesia | 12 – 13 | Vietnam | 
| Malaysia | 7 – 4 | Thailand | 
| Philippines | 6 – 7 | Singapore | 
| 23 November 2005 | ||
| Vietnam | 7 – 8 | Malaysia | 
| Singapore | 16 – 7 | Indonesia | 
| Thailand | 2 – 10 | Philippines | 
| 24 November 2005 | ||
| Indonesia | 6 – 4 | Malaysia | 
| Philippines | 13 – 3 | Vietnam | 
| Singapore | 12 – 3 | Thailand | 
| 25 November 2005 | ||
| Thailand | 5 – 5 | Indonesia | 
| Vietnam | 4 – 15 | Singapore | 
| Philippines | 8 – 2 | Malaysia | 
Games Records
- Men's 50 m Freestyle: Thailand's Arwut Chinnapasaen, 22.98
- (previous record of 23.03 was set in ? by Richard Sambera)
- Men's 4x200 m Freestyle Relay: Singapore's Chay Jung Jun Mark, Cheah Mingzhe Marcus, Tan Lee Yu Gary, Tay Zhi Rong Bryan, 7:35.85
- (previous record of 7:38:82 was set in 2001 by Singapore's relay team)
- Women's 50 m Freestyle: Singapore's Joscelin Yeo, 26.13
- (previous record of 26.23 was set in ? by ?)
- (previous record of ? was set in ? by ?)
- Women's 100 m Butterfly: Singapore's Joscelin Yeo, 59.91
- (previous record of 1:00.44 was set in 1999 by Joscelin Yeo)
- (previous record of ? was set in 1999 by Joscelin Yeo)
- Women's 4x100 m Medley Relay: Singapore's Ho Shu Yong, Tao Li, Nicolette Teo, Joscelin Yeo, 4:14.49
- (previous record of 4:19.23 was set in 1997 by Indonesia's relay team)