These are the results of the men's K-1 1000 metres competition in canoeing at the 1948 Summer Olympics. The K-1 event is raced by single-man canoe sprint kayaks. Heat and semifinals took place on August 12.
The 15 competitors first raced in two heats. The top four finishers in both heats moved directly to the final.
| Heat 1 | |||||
| width=30 | 1. | width=60 | 4:51.9 | QF | |
| 2. | 4:52.0 | QF | |||
| 3. | 4:52.2 | QF | |||
| 4. | 4:52.8 | QF | |||
| 5. | 5:00.1 | ||||
| 6. | 5:05.5 | ||||
| 7. | 5:10.8 | ||||
| Heat 2 | |||||
| 1. | 4:40.9 | QF | |||
| 2. | 4:45.4 | QF | |||
| 3. | 4:45.5 | QF | |||
| 4. | 4:46.2 | QF | |||
| 5. | 4:46.5 | ||||
| 6. | 4:58.0 | ||||
| 7. | 4:59.8 | ||||
| 8. | 5:00.1 |
| width=30 style="background:gold;" | 4:33.2 | ||
| 4:39.9 | |||
| 4:41.4 | |||
| 4. | 4:41.7 | ||
| 5. | 4:43.5 | ||
| 6. | 4:44.2 | ||
| 7. | 4:44.3 | ||
| 8. | 4:50.3 |
In the heats, Fredriksson was fourth with 50 meters left and sprinted to the win. Fredriksson's margin of victory is the largest in any Olympic kayak final that was not 10,000 meters in length.