| 24 Aug | National Championship Sprint & Carpath-O Trophy stage 3 |  Romania | Europe | F | World Ranking Event | S | |  |
| 26 Aug - 30 Aug | Asian Junior and Youth Orienteering Championships 2025 |  Japan | Asia | F | Regional Championships | | | |
| 26 Aug - 31 Aug | European Orienteering Championships 2025 - Orienteering World Cup Round 2 |  Belgium | Europe | F | Regional Championships
World Cup | | | |
| 26 Aug - 31 Aug | World Trail Orienteering Championships 2025 |  Hungary
 Slovakia | Europe | T | World Championships
World Ranking Event | | | |
| 31 Aug | The 20th anniversary of the merger of Shitara Town orienteering competition | Japan | Asia | F | World Ranking Event | L | | |
| 4 Sep | SEE(M)OC Middle distance |  Bulgaria | Europe | F | World Ranking Event | M | 23/8 |  |
| 5 Sep | SEE(M)OC Long distance | Bulgaria | Europe | F | World Ranking Event | L | 23/8 | |
| 6 Sep | THAILAND INTERNATIONAL ORIENTEERING CHAMPIONSHIPS |  Thailand | Asia | F | World Ranking Event | S | 3/9 | |
| 6 Sep | Nationale Sud-Est Moyenne Distance |  France | Europe | F | World Ranking Event | M | | |
| 6 Sep | Czech Cup |  Czechia | Europe | F | World Ranking Event | M | 26/8 | |
| 7 Sep | THAILAND INTERNATIONAL ORIENTEERING CHAMPIONSHIPS | Thailand | Asia | F | World Ranking Event | S | 1/9 | |
| 7 Sep | SEE(M)OC Sprint distance | Bulgaria | Europe | F | World Ranking Event | S | 23/8 | |
| 7 Sep | Nationale Sud-Est Longue Distance | France | Europe | F | World Ranking Event | L | | |
| 7 Sep | Swiss Championships Long |  Switzerland | Europe | F | World Ranking Event | L | 25/8 | |
| 7 Sep | Finnish Orienteering Championship, Long distance |  Finland | Europe | F | World Ranking Event | L | 28/8 | |
| 11 Sep | Testrace Sprint | Switzerland | Europe | F | World Ranking Event | S | 25/8 | |
| 13 Sep | TuMe100, TempO | Finland | Europe | T | World Ranking Event | T | 9/9 | |
| 13 Sep | Swiss Championships Middle | Switzerland | Europe | F | World Ranking Event | M | 25/8 | |
| 14 Sep | TuMe100, PreO | Finland | Europe | T | World Ranking Event | P | 9/9 | |
| 14 Sep | Camp. Italiani Long |  Italy | Europe | F | World Ranking Event | L | 8/9 | |
| 14 Sep | ÖSTM Middle (6. Austria Cup 2025) |  Austria | Europe | F | World Ranking Event | M | 5/9 | |
| 14 Sep | DM Lang |  Denmark | Europe | F | World Ranking Event | L | 1/9 | |
| 18 Sep - 21 Sep | CX80 World Cup in MTB Orienteering and U23 World MTB Orienteering Championships 2025 | Bulgaria | Europe | M | World Cup
World Ranking Event | | | |
| 19 Sep | Mentor Silva Cup | Romania | Europe | F | World Ranking Event | S | 5/9 | |
| 19 Sep | NC sprint |  Aas IL | Europe | F | World Ranking Event | S | 14/9 | |
| 20 Sep | Hungarian Sprint Championships | Hungary | Europe | F | World Ranking Event | S | 8/9 | |
| 20 Sep | NC mellom | Aas IL | Europe | F | World Ranking Event | M | 14/9 | |
| 20 Sep | Finnish Orienteering Championship, Sprint distance | Finland | Europe | F | World Ranking Event | S | 9/9 | |
| 21 Sep | Mentor Silva Cup | Romania | Europe | F | World Ranking Event | M | 5/9 | |
| 25 Sep - 29 Sep | Orienteering World Cup Round 3 | Switzerland | Europe | F | World Cup | | | |
| 27 Sep | Magaziin Orienteering Games long distance |  Estonia | Europe | F | World Ranking Event | L | | |
| 27 Sep | Australian Sprint Distance Championships |  Australia | Oceania | F | World Ranking Event | S | | |
| 27 Sep | IX Campeonato Centroamericano y del Caribe de Orientación |  Costa Rica | North America | F | World Ranking Event | M | 15/9 | |
| 28 Sep | Australian Long Distance Championships | Australia | Oceania | F | World Ranking Event | L | | |
| 28 Sep | Magaziin Orienteering Games middle distance | Estonia | Europe | F | World Ranking Event | M | | |
| 28 Sep | IX Campeonato Centroamericano y del Caribe de Orientación | Costa Rica | North America | F | World Ranking Event | S | 15/9 | |
