Aquatics at the 1995 Southeast Asian Games included swimming, diving and water polo events and were held at Aquatic Centre in 700th Anniversary Sport Complex, Chiang Mai, Thailand. Aquatics events was held between 10 December to 15 December.
| 50 m freestyle |  Richard Sam Bera | 23.42 | Wisnu Wardhana | 24.21 |  Ernest Teo Guee Lim | 24.21 | |
| 100 m freestyle | Richard Sam Bera | 52.11 | Wisnu Wardhana | 52.98 |  Padhanaseth Changkasiri | 53.21 | |
| 200 m freestyle | Torlarp Sethsothorn | 1:53.92 |  Raymond Papa | 1:54.66 | Vicha Ratanachote | 1:55.09 | |
| 400 m freestyle | Torlarp Sethsothorn | 3:57.43 | Vicha Ratanachote | Albert Sutanto | |||
| 1500 m freestyle | Torlarp Sethsothorn | 15:43.27 | Asawin Okada | 16:05.46 | Albert Sutanto | 16:39.89 | |
| 100 m backstroke | Raymond Papa | 58.03 | Dulyarit Phuangthong | 58.81 | Gerald Koh | 59.76 | |
| 200 m backstroke | Raymond Papa | 2:03.79 | Dulyarit Phuangthong | 2:06.49 | Gerald Koh | 2:07.69 | |
| 100 m breaststroke | Ratapong Sirisanont | 1:04.37 | Desmond Koh | 1:05.59 |  Elvin Chia Tshun Thau | 1:06.64 | |
| 200 m breaststroke | Ratapong Sirisanont | 2:16.54 | Elvin Chia Tshun Thau | 2:23.70 | Audi Octavian | 2:24.92 | |
| 100 m butterfly | Anthony Ang | 55.83 | Wisnu Wàrdhana | 57.39 | Nuttapol Chavanavanichwoot | 57.49 | |
| 200 m butterfly | Anthony Ang | 2:05.34 | Niti Intharapichai | 2:05.74 | Thum Ping Tjin | 2:06.26 | |
| 200 m individual medley | Ratapong Sirisanont | 2:04.74 | Desmond Koh | 2:07.80 | Dulyarit Phuangthong | 2:08.44 | |
| 400 m individual medley | Ratapong Sirisanont | 4:27.91 | Desmond Koh | 4:31.84 | Wan Azlan Wan Abdullah | 4:33.86 | |
| 4 × 100 m freestyle relay | Indonesia Albert Sutanto Felix Sutanto Richard Sam Bera Wisnu Wardhana | 3:31.03 | Thailand Pawin Kohvathana Padhanaseth Changkasiri Kittibhund Paomahanaka Vicha Ratanachote | 3:31.29 | Singapore Thum Ping Tjin Ernest Teo Guee Lim Peter Weng Weong Sng Ju Wei | ||
| 4 × 200 m freestyle relay | Thailand Vicha Ratanachote Dulyarit Phuangthong Ratapong Sirisanont Torlarp Sethsothorn | 7:39.39 | Singapore Thum Ping Tjin Sng Ju Wei Gerald Koh Desmond Koh | 7:50.91 | Indonesia Albert Sutanto Wisnu Felix Sutanto Richard Sam Bera | 7:50.91 | |
| 4 × 100 m medley relay | Thailand Dulyarit Phuangthong Ratapong Sirisanont Nuttapol Chavanavanichwoot Padhanaseth Changkasiri | 3:51.60 | Malaysia Alex Lim Anthony Ang Elvin Chia Wan Azlan Abdullah | 3:55.72 | Singapore Gerald Koh Desmond Koh Thum Ping Tjin Ju Wei | 3:56.17 | |
| 50 m freestyle | Joscelin Yeo | 26.73 | Donhatai Rongsawat | 27.49 | Meitri Widya | 27.76 | |
| 100 m freestyle | Joscelin Yeo | 57.27 | Meitri Widya | 59.19 | Elsa Manora | 59.72 | |
| 200 m freestyle | Joscelin Yeo | 2:04.01 | Ravee Intapornudom | 2:05.99 | Nusra Chinnaphasaen | 2:06.43 | |
| 400 m freestyle | Joscelin Yeo | 4:23.05 | Ravee Intapornudom | 4:23.29 | Hataikan Leelakitichok | 4:27.90 | |
| 800 m freestyle | Ravee Intapornudom | 9:04.32 | Hataikan Leelakitichok | 9:11.51 | Susanti | 9:35.93 | |
| 100 m backstroke | Praphalsai Minpraphal | 1:04.87 | Elsa Manora | 1:05.97 | Tang Cheryl | 1:07.57 | |
| 200 m backstroke | Praphalsai Minpraphal | 2:19.02 | Elsa Manora | 2:23.68 | Chonthon Voratamrong | 2:25.51 | |
| 100 m breaststroke | Joscelin Yeo | 1:11.37 | Songporn Leelakitichock | 1:14.68 | Rasnin Sittart | 1:15.12 | |
| 200 m breaststroke | Rapeeporn Wongsiriroj | 2:40.55 | Rita | 2:41.37 | Monthakan Khamphiw | 2:41.75 | |
| 100 m butterfly | Joscelin Yeo | 1:01.59 | Elsa Manora | 1:02.85 | Nusra Chinnaphasaen | 1:02.98 | |
| 200 m butterfly | Praphalsai Minpraphal | 2:15.60 | Nusra Chinnaphasaen | 2:16.30 | Catherine | 2:19.62 | |
| 200 m individual medley | Joscelin Yeo | 2:17.87 | Praphalsai Minpraphal | 2:19.88 | Elsa Manora | 2:23.82 | |
| 400 m individual medley | Praphalsai Minpraphal | 4:54.24 | Ravee Intapornudom | 5:02.14 | Elsa Manora | 5:05.58 | |
| 4 × 100 m freestyle relay | Thailand Donhatai Rongsawat Nusra Chinnaphasaen Praphalsai Minpraphal Ravee Intapornudom | 3:55.99 | Singapore May Ooi Joscelin Yeo Tang Cheryl Eadelin | 3:57.94 | Indonesia Meitri Widya Catherine Olga Elsa Manora | 3:59.17 | |
| 4 × 100 m medley relay | Thailand Praphalsai Minpraphal Songporn Leelakitichock Nusra Chinnaphasaen Ravee Intapornudom | 4:22.19 | Singapore Tang Cheryl Joscelin Yeo May Ooi Eadelin | 4:23.02 | Indonesia Elsa Manora Olga Catherine Meitri Widya | 4:25.70 | |
| Men's 1 m springboard | Temmy | 375.31 | Suchat Pichi | 362.14 | Anupan Atthainsee | 346.20 | |
| Men's 3 m springboard | Suchat Pichi | 676.80 | Anupan Atthainsee | 655.47 | Temmy | 644.85 | |
| Men's 10 m platform | Suchat Pichi | 673.95 | Bundit Silivong | 545.43 | Banriansyah | 522.03 | |
| Women's 1 m springboard | Sureerat Atthainsee | 254.73 | Jidapone Srimoung | 251.19 | Nani W | 242.85 | |
| Women's 3 m springboard | Sukrutai Tommaoros | 498.27 | Jean Elaine | 480.48 | Dwi Mariastuti | 469.92 | |
| Women's 10 m platform | Sukrutai Tommaoros | 506.43 | Nani W | 449.97 | Dawi Mariastuti | 438.24 |
| Men's team | Singapore | Thailand | Philippines |