| Most recent season or competition: 2024 IAU 100 km World Championship | |
| Sport | Ultramarathon |
|---|---|
| First season | 1987 |
| Country | Worldwide |
| Official website | https://iau-ultramarathon.org/ |
TheIAU 100 km World Championships have been held annually since 1987, at different locations, and is organized by theInternational Association of Ultrarunners (IAU).[1][2] Due to lack of sponsorship, the 2013 event, planned forJeju Island, South Korea,[3] was cancelled and the 2014 event, originally due to be held atDaugavpils, Latvia, was held instead inDoha,Qatar.
The championships from 2007 to 2012 incorporated theIAU 100 km European Championships.[4]
| Rank | Nation | Gold | Silver | Bronze | Total |
|---|---|---|---|---|---|
| 1 |  Japan | 7 | 2 | 3 | 12 |
| 2 |  Russia | 6 | 7 | 6 | 19 |
| 3 |  Italy | 6 | 0 | 3 | 9 |
| 4 |  France | 4 | 3 | 4 | 11 |
| 5 |  Spain | 2 | 4 | 3 | 9 |
| 6 |  Brazil | 2 | 0 | 0 | 2 |
| 7 |  Sweden | 1 | 4 | 0 | 5 |
| 8 |  United States | 1 | 2 | 3 | 6 |
| 9 |  Great Britain | 1 | 1 | 1 | 3 |
| 10 |  Ukraine | 1 | 0 | 0 | 1 |
| 11 |  Poland | 0 | 4 | 1 | 5 |
| 12 |  South Africa | 0 | 1 | 1 | 2 |
| 13 |  Belgium | 0 | 1 | 0 | 1 |
 Netherlands | 0 | 1 | 0 | 1 | |
 New Zealand | 0 | 1 | 0 | 1 | |
| 16 |  Germany | 0 | 0 | 3 | 3 |
| 17 |  Canada | 0 | 0 | 1 | 1 |
| Totals (17 entries) | 31 | 31 | 29 | 91 | |
| Rank | Nation | Gold | Silver | Bronze | Total |
|---|---|---|---|---|---|
| 1 | Russia | 9 | 5 | 5 | 19 |
| 2 | Great Britain | 7 | 2 | 6 | 15 |
| 3 | United States | 5 | 3 | 1 | 9 |
| 4 | Japan | 2 | 2 | 4 | 8 |
| 5 | France | 1 | 5 | 1 | 7 |
| 6 | Italy | 1 | 3 | 5 | 9 |
| 7 | Germany | 1 | 2 | 3 | 6 |
| 8 |  Hungary | 1 | 2 | 2 | 5 |
| 9 |  Croatia | 1 | 1 | 1 | 3 |
| 10 |  Slovakia | 1 | 1 | 0 | 2 |
| 11 |  Switzerland | 1 | 0 | 0 | 1 |
| 12 | Sweden | 0 | 2 | 0 | 2 |
| 13 | South Africa | 0 | 1 | 1 | 2 |
| 14 |  Australia | 0 | 1 | 0 | 1 |
| New Zealand | 0 | 1 | 0 | 1 | |
| 16 | Brazil | 0 | 0 | 1 | 1 |
| Poland | 0 | 0 | 1 | 1 | |
| Totals (17 entries) | 30 | 31 | 31 | 92 | |
