1912 Finnish championships in aquatics
From 1906 to 1926, the Finnish Swimming Federation did not arrange a dedicated national competition, but spread out the hosting duties of the championship events to multiple clubs.
Diving
Men
Plain
Competed in Helsinki on 21 July 1912.Source:
Platform
Competed in Turku on 11 August 1912.| Rank | Name | Placing figure | Score |
| Toivo Aro | 3 | 203.40 points | |
| Leo Suni | 7 | 192.43 points | |
| Oskar Wetzell | 8 | 191.38 points |
Source:
Springboard
Competed in Helsinki on 21 July 1912.| Rank | Name | Placing figure | Score |
| Oskar Wetzell | 4 | 325.45 points | |
| Albert Nyman | 8 | 313.62 points |
Source:
Women
Platform
Competed in Turku on 11 August 1912.| Rank | Name | Placing figure | Score |
| Senni Aaltonen | 3 | 98.25 points | |
| Anna Järvinen | 7 | 84.50 points | |
| Hilda Kuusela | 8 | 82.25 points |
Source:
Swimming
Men
100 metre freestyle
Competed in Helsinki on 20 July 1912.| Rank | Name | Time |
| Jussi Kahma | 1:11.5 NR | |
| Martti Salokannel | 1:18.8 | |
| Yrjö Seuderling | 1:19.3 | |
| 4 | K. Salmi | 1:26.9 |
| 5 | W. Petroff | 1:27.0 |
| 6 | M. Koroleff | 1:29.0 |
Source:
500 metre freestyle
Competed in Vaasa on 27 July 1912.| Rank | Name | Time |
| Martti Salokannel | 8:26.6 | |
| G. Hanstén | 8:43.6 | |
| V. Petroff | 8:57.8 |
Source:
1000 metre freestyle
Competed in Helsinki on 21 July 1912.| Rank | Name | Time |
| Martti Salokannel | 18:49.6 | |
| Arvo Aaltonen | 19:09.2 | |
| V. Petroff | 19:11.3 |
Source:
100 metre backstroke
Competed in Helsinki on 19 July 1912.| Rank | Name | Time |
| Lennart Lindroos | 1:36.3 NR | |
| J. Wiklund | 1:37.9 |
Source:
100 metre breaststroke
Competed in Vaasa on 27 July 1912.| Rank | Name | Time |
| Arvo Aaltonen | 1:23.1 NR | |
| Lennart Lindroos | 1:24.7 |
Source:
200 metre breaststroke
Competed in Helsinki on 20 July 1912.| Rank | Name | Time |
| Arvo Aaltonen | 3:00.0 | |
| Lennart Lindroos | 3:11.0 | |
| Vilhelm Lindgrén | 3:13.1 | |
| 4 | H. Wasenius | 3:17.5 |
Source:
Aaltonen's result broke the world record. It could not be ratified, because the track was inspected to be two centimetres too short.
400 metre breaststroke
Competed in Vaasa on 28 July 1912.| Rank | Name | Time |
| Arvo Aaltonen | 6:33.4 NR |
Source:
100 metre life saving
Competed in Vaasa on 28 July 1912.| Rank | Name | Time |
| Herman Cederberg | 1:52.7 NR | |
| Jussi Kahma | 2:00.3 |
Source:
4 × 50 metre freestyle relay
Competed in Turku on 10 August 1912.| Rank | Club | Team | Time |
| Vaasan Uimaseura | Artturi Helenius, Jussi Kahma, Martti Salokannel, Uuno Mäkipää | 2:12.9 | |
| Helsingfors Simsällskapet | M. Koroleff, H. Wasenius, H. Bergström, I. Sjöström | 2:20.4 | |
| Turun Uimaseura | Väinö Hannula, R. Lönnqvist, Bruno Lindberg, Yrjö Seuderling | 2:25.0 |
Source:
Women
50 metre freestyle
Competed in Turku on 11 August 1912.| Rank | Name | Time |
| Lilly Blomster | 38.4 NR | |
| Anna Järvinen | 42.4 | |
| Hilda Kuusela | 44.1 | |
| 4 | Sofia Gylling | 45.9 |
| 5 | Edit Grönholm | 47.3 |
| 6 | Olga Haapanen | 48.3 |
Source:
100 metre freestyle
Competed in Vaasa on 28 July 1912.| Rank | Name | Time |
| Anna Järvinen | 1:39.3 NR | |
| Lilly Blomster | 1:39.5 | |
| Tyyne Järvi | 1:41.9 |
Source:
Water polo
Men
Competed in Helsinki on 20 July 1912.| Rank | Club | Team |
| Helsingfors Simsällskap | ? | |
| Tampereen Uimaseura | ? |
The championship was settled by one match, won by Helsingfors Simsällskap 6–0.