Aquatics at the 1990 Commonwealth Games consisted of diving, swimming and synchronized swimming. They were held in Henderson, New Zealand.
| 1 m springboard | 583.65 | 547.35 | 546.87 | ||||
| 3 m springboard | 594.84 | 569.97 | 569.79 | ||||
| 10 m platform | 639.84 | 555.54 | 544.5 |
| 1 m springboard | 443.28 | 423.93 | 418.71 | ||||
| 3 m springboard | 491.79 | 458.43 | 457.29 | ||||
| 10 m platform | 391.68 | 380.49 | 380.43 |
| 50 m freestyle | 22.76 GR | 23.03 | 23.16 | |||||||
| 100 m freestyle | 49.80 CWR | 50.49 | 50.76 | |||||||
| 200 m freestyle | 1:49.58 GR | align=right | 1:49.60 | align=right | 1:49.98 | |||||
| 400 m freestyle | align=right | 3:49.91 GR | align=right | 3:53.90 | align=right | 3:54.04 | ||||
| 1500 m freestyle | align=right | 14:55.25 GR | align=right | 14:58.08 | align=right | 15:09.25 | ||||
| 100 m backstroke | align=right | 56.07 | align=right | 56.84 | align=right | 57.07 | ||||
| 200 m backstroke | align=right | 2:01.69 | align=right | 2:01.86 | align=right | 2:02.02 | ||||
| 100 m breaststroke | align=right | 1:01.49 | align=right | 1:03.15 | align=right | 1:03.16 | ||||
| 200 m breaststroke | align=right | 2:14.96 | align=right | 2:15.68 | align=right | 2:16.02 | ||||
| 100 m butterfly | align=right | 53.98 | align=right | 54.42 | align=right | 54.47 | ||||
| 200 m butterfly | align=right | 1:57.33 | align=right | 1:59.95 | align=right | 2:00.37 | ||||
| 200 m individual medley | align=right | 2:02.94 | align=right | 2:03.78 | align=right | 2:04.03 | ||||
| 400 m individual medley | align=right | 4:20.26 | align=right | 4:21.79 | align=right | 4:23.96 | ||||
| 4 × 100 m freestyle relay | Andrew Baildon Chris Fydler Ian Vander-Wal Jason Cooper Matthew Renshaw Thomas Stachewicz | align=right | 3:20.05 | Austyn Shortman Mark Foster Mike Fibbens Neil Metcalfe Steve Dronsfield | align=right | 3:22.61 | Blair Hicken Darren Ward Marcel Gery Stephane Herbert Stephen Vandermeulen | align=right | 3:22.79 | |
| 4 × 200 m freestyle relay | Gary Lord Ian Brown Martin Roberts Thomas Stachewicz | align=right | 7:21.17 | Edward Parenti Gary Vandermeulen Jon Kelly Turlough O'Hare | align=right | 7:25.53 | Anthony Mosse John Steel Richard Tapper Ross Anderson | align=right | 7:30.10 | |
| 4 × 100 m medley relay | Jon Cleveland Marcel Gery Mark Tewksbury Tom Ponting | align=right | 3:42.45 | Adrian Moorhouse Austyn Shortman Gary Binfield Mike Fibbens | align=right | 3:43.88 | Andrew Baildon Chris Fydler Phil Rogers Thomas Stachewicz | align=right | 3:43.91 |
| 50 m freestyle | 25.80 CWR | align=right | 26.00 | align=right | 26.26 | |||||
| 100 m freestyle | align=right | 56.48 CWR | align=right | 56.61 | align=right | 56.67 | ||||
| 200 m freestyle | align=right | 2:00.79 | align=right | 2:02.43 | align=right | 2:02.66 | ||||
| 400 m freestyle | align=right | 4:08.89 | align=right | 4:09.72 | align=right | 4:10.74 | ||||
| 800 m freestyle | align=right | 8:30.27 | align=right | 8:30.47 | align=right | 8:36.78 | ||||
| 100 m backstroke | align=right | 1:02.46 | align=right | 1:02.55 | align=right | 1:03.69 | ||||
| 200 m backstroke | align=right | 2:12.32 | align=right | 2:12.62 | align=right | 2:14.53 | ||||
| 100 m breaststroke | align=right | 1:10.74 | align=right | 1:11.22 | align=right | 1:11.54 | ||||
| 200 m breaststroke | align=right | 2:32.16 | align=right | 2:32.91 | align=right | 2:33.57 | ||||
| 100 m butterfly | align=right | 1:00.66 | align=right | 1:01.03 | align=right | 1:01.33 | ||||
| 200 m butterfly | align=right | 2:32.16 | align=right | 2:32.91 | align=right | 2:33.57 | ||||
| 200 m individual medley | align=right | 2:15.61 | align=right | 2:17.10 | align=right | 2:17.13 | ||||
| 400 m individual medley | align=right | 4:42.65 | align=right | 4:45.76 | align=right | 4:47.38 | ||||
| 4 × 100 m freestyle relay | Angela Mullens Karen van Wirdum Lisa Curry-Kenny Susan O'Neill | align=right | 3:46.85 | Allison Higson Erin Murphy Kimberley Paton Patricia Noall | align=right | 3:48.69 | June Croft Karen Pickering Sharron Davies Zara Long | align=right | 3:51.26 | |
| 4 × 200 m freestyle relay | Hayley Lewis Janelle Elford Jennifer McMahon Julie McDonald | align=right | 8:08.95 | Joanna Coull Judy Lancaster June Croft Sharron Davies | align=right | 8:16.31 | Linda Robinson Michelle Burke Phillippa Langrell Sharon Hanley | align=right | 8:22.60 | |
| 4 × 100 m medley relay | Karen van Wirdum Lara Hooiveld Lisa Curry-Kenny Nicole Livingstone | align=right | 4:10.87 | Joanne Deakins Karen Pickering Madeleine Scarborough Suki Brownsdon | align=right | 4:11.88 | Keltie Duggan Lori Melien Nancy Sweetnam Patricia Noall | align=right | 4:12.20 |
| Solo | 196.68 | 184.79 | 173.320 | ||||
| Duet | Kathy Glen Christine Larsen | 191.23 | Sarah Northey Kerry Shacklock | 185.435 | Lisa Barbara Lieschke Semon Elke Rohloff | 175.765 | |
| Figures | 99.16 | 94.74 | 94.52 |