| 18 Apr | New Zealand Orienteering Championships Sprint |  New Zealand | Oceania | F | World Ranking Event | S | |  |
| 18 Apr | JK 2025 |  Great Britain | Europe | F | World Ranking Event | S | | |
| 18 Apr | Hungarian Selection Races - Sprint |  Hungary | Europe | F | World Ranking Event | S | | |
| 19 Apr | New Zealand Orienteering Championships Middle | New Zealand | Oceania | F | World Ranking Event | M | | |
| 19 Apr | Day 1, Australian 3 Day |  Australia | Oceania | F | World Ranking Event | M | | |
| 19 Apr | Nationale Moyenne Distance |  France | Europe | M | World Ranking Event | M | | |
| 19 Apr | JK 2025 | Great Britain | Europe | F | World Ranking Event | M | | |
| 19 Apr | Hungarian Selection Races - Middle | Hungary | Europe | F | World Ranking Event | M | | |
| 20 Apr | New Zealand Orienteering Championships Long | New Zealand | Oceania | F | World Ranking Event | L | | |
| 20 Apr | Day 2, Australian 3 Day | Australia | Oceania | F | World Ranking Event | L | | |
| 20 Apr | JK 2025 | Great Britain | Europe | F | World Ranking Event | L | | |
| 20 Apr | Hungarian Selection Races - Long | Hungary | Europe | F | World Ranking Event | L | | |
| 21 Apr | Lieldienu balva |  Latvia | Europe | F | World Ranking Event | KS | | |
| 21 Apr | Championnat de France Mass Start | France | Europe | M | World Ranking Event | L | | |
| 25 Apr | Coppa Italia Long - Latinum Certamen |  Italy | Europe | F | World Ranking Event | L | | |
| 25 Apr | ASOM2025 Knock-Out Sprint |  Belgium | Europe | F | World Ranking Event | S | | |
| 25 Apr | Metropolis of South East Europe 2025 - Sprint |  Serbia | Europe | F | World Ranking Event | S | | |
| 26 Apr | Sprint - Latinum Certamen | Italy | Europe | F | World Ranking Event | S | | |
| 26 Apr | Värska Originaal Finnish Spring |  Finland | Europe | F | World Ranking Event | L | | |
| 26 Apr | Metropolis of South East Europe 2025 | Serbia | Europe | F | World Ranking Event | M | | |
| 27 Apr | Camp. Italiani Middle - Latinum Certamen | Italy | Europe | F | World Ranking Event | M | | |
| 27 Apr | ASOM2025 Sprint | Belgium | Europe | F | World Ranking Event | S | | |
| 1 May | Swedish League, #3, medel (WRE) |  Sweden | Europe | F | World Ranking Event | M | | |
| 1 May - 4 May | World Masters MTB Orienteering Championships 2025 |  Spain | Europe | M | World Masters | | | |
| 2 May | Bukowa Cup |  Poland | Europe | T | World Ranking Event | P | | |
| 2 May | Brazilian Orienteering Championships |  Brazil | South America | F | World Ranking Event | M | | |
| 3 May | Tsutsuji matsuri |  Japan | Asia | F | World Ranking Event | M | | |
| 3 May | IV International Trophy MURCIA COSTA CÁLIDA MTBO LONG DISTANCE | Spain | Europe | M | World Ranking Event | L | | |
| 3 May | Brazilian Orienteering Championships | Brazil | South America | F | World Ranking Event | L | | |
| 3 May | Bukowa Cup | Poland | Europe | T | World Ranking Event | P | | |
| 3 May | Vilnius 2025 – 3 days orienteering event |  Lithuania | Europe | F | World Ranking Event | M | | |
| 4 May | IV International Trophy MURCIA COSTA CÁLIDA MTBO SPRINT | Spain | Europe | M | World Ranking Event | S | | |
| 4 May | Bukowa Cup | Poland | Europe | T | World Ranking Event | T | | |
| 10 May | Czech Cup |  Czechia | Europe | F | World Ranking Event | S | | |
| 10 May | SM, medel (Swedish League #), final | Sweden | Europe | F | World Ranking Event | M | | |
| 10 May | British Orienteering Championships 2025 | Great Britain | Europe | F | World Ranking Event | L | | |
| 10 May | Estonian championships in Middle distance |  Estonia | Europe | F | World Ranking Event | M | | |
| 11 May | Swiss Championships Sprint |  Switzerland | Europe | F | World Ranking Event | KS | | |
| 14 May - 18 May | CX80 World Cup in MTB Orienteering and Apresport European MTB Orienteering Championships 2025 | Lithuania | Europe | M | Regional Championships
World Cup
World Ranking Event | | | |
| 15 May - 18 May | European Junior and Youth MTB Orienteering Championships 2025 | Lithuania | Europe | M | Regional Championships | | | |
| 17 May - 30 May | World Masters Games 2025 |  Chinese Taipei | Asia | F | Partner Event | | | |
| 17 May | Austria Cup & Austrian Championship Long Distance |  Austria | Europe | F | World Ranking Event | L | | |
| 17 May | FinTrailO 2025, PreO | Finland | Europe | T | World Ranking Event | P | 15/5 | |
| 18 May | FinTrailO 2025, TempO | Finland | Europe | T | World Ranking Event | T | 15/5 | |
| 24 May | Baltic Orienteering Championships | Latvia | Europe | F | World Ranking Event | L | | |
| 24 May | VM uttak mellom |  Norway | Europe | F | World Ranking Event | M | | |