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Date: 22 August 1920 / 23 August 1920 / 29 August 1920
Heats
Semi-finals
Final
| Rank | Name | Nation | Time |
| 1 | Duke Kahanamoku | USA | 1:01.4 |
| 2 | Pua Kele Kealoha | USA | 1:02.6 |
| 3 | William Harris | USA | 1:03.0 |
| 4 | William Herald | AUS | 1:03.8 |
| 5 | Norman Ross | USA | |
| Semi-finals | |||
| 6 | George Vernot | CAN | 1:05.8 |
| 7 | Agostino Frassinetti | ITA | |
| 7 | Ivan Stedman | AUS | |
| 9 | Vaclav Buchacek | TCH | |
| 9 | Orvar Trolle | SWE | |
| 11 | Henry Hay | AUS | |
| 11 | Keith Kirkland | AUS | |
| 13 | Ko Korsten | NED | |
| Heats | |||
| 14 | Henri Padou Sr. | FRA | 1:08.4 |
| 15 | Jean van Silfhout | NED | 1:09.0 |
| 16 | John Dickin | GBR | 1:10.0 |
| 17 | Mario Massa | ITA | 1:10.4 |
| 18 | Angelo Gammaro | BRA | 1:22.0 |
| 19 | Georges Pouilley | FRA | |
| 19 | Harold Annison | GBR | |
| 19 | Martial Van Schelle | BEL | |
| 19 | Leon Pesch | LUX | |
| 19 | Remy Weil | FRA | |
| 19 | Alfred Steen | NOR | |
| 25 | Albert Dickin | GBR | |
| 25 | Jean Jenni | SUI | |
| 25 | Leslie Savage | GBR | |
| 25 | Masaren Uchida | JPN | |
| 29 | Kenkichi Saito | JPN | |
| 29 | Orlando Amendola | BRA | |
| 31 | Gerard Blitz | BEL | |