3 Feb - 8 Feb | European Ski Orienteering Championship 2018 and World Cup Round 2 | Bulgaria | Europe | S | Regional Championships World Cup World Ranking Event | | |  |
4 Feb - 8 Feb | European Youth Ski Orienteering Championships | Bulgaria | Europe | S | Regional Championships | | |  |
4 Feb - 8 Feb | Junior World Ski Orienteering Championships | Bulgaria | Europe | S | Junior World Championships World Ranking Event | | |  |
6 Mar - 10 Mar | Ski Orienteering World Cup Round 3 | United States | North America | S | World Cup | | |  |
6 Mar - 10 Mar | World Masters Ski Orienteering Championships 2018 | United States | North America | S | World Masters | | |  |
28 Apr - 1 May | European Trail Orienteering Championships 2018 | Slovakia | Europe | T | Regional Championships | | |  |
6 May - 13 May | European Orienteering Championships 2018 & World Cup Round 1 | Switzerland | Europe | F | Regional Championships World Cup | | |  |
27 Jun - 1 Jul | European Junior MTB Orienteering Championships | Hungary | Europe | M | Regional Championships | | |  |
27 Jun - 1 Jul | European MTB Orienteering Championships and World Cup Round 1 | Hungary | Europe | M | World Cup World Ranking Event Regional Championships | | |  |
27 Jun - 1 Jul | World Masters MTB Orienteering Championships 2018 | Hungary | Europe | M | World Masters | | |  |
28 Jun - 1 Jul | European Youth Orienteering Championships 2018 | Bulgaria | Europe | F | Regional Championships | | | |
1 Jul | World Masters MTB Orienteering unofficial relay | Hungary | Europe | M | World Masters | R | | |
6 Jul - 13 Jul | World Masters Orienteering Championships 2018 | Denmark | Europe | F | World Masters | | |  |
9 Jul - 14 Jul | Junior World Orienteering Championships | Hungary | Europe | F | Junior World Championships World Ranking Event | | |  |
3 Aug - 11 Aug | Nokian Tyres World Orienteering Championships 2018 | Latvia | Europe | F | World Cup World Championships | | |  |
4 Aug - 10 Aug | World Trail Orienteering Championships 2018 | Latvia | Europe | T | World Championships | | |  |
5 Aug - 12 Aug | European Youth MTB Orienteering Championships | Austria | Europe | M | Regional Championships | | | |
5 Aug - 12 Aug | World MTB Orienteering Championships & World Cup 2 & Junior World MTB Orienteering Championship | Austria | Europe | M | World Championships Junior World Championships World Cup | | |  |
18 Aug - 21 Aug | North American Orienteering Championships | Canada | North America | F | Regional Championships World Ranking Event | | |  |
30 Aug - 2 Sep | World Cup round 3 & Pre-WOC | Norway | Europe | F | World Cup World Ranking Event | | |  |
21 Sep - 23 Sep | MTB Orienteering World Cup Round 3 | Portugal | Europe | M | World Cup World Ranking Event | | |  |
4 Oct - 7 Oct | World Cup Round 4 | Czech Republic | Europe | F | World Cup World Ranking Event | | |  |
6 Nov | South American Orienteering Championships, long | Uruguay | South America | F | Regional Championships World Ranking Event | L | |  |
6 Nov | South American Orienteering Championships, sprint | Uruguay | South America | F | Regional Championships World Ranking Event | S | |  |
7 Nov | South American Orienteering Championships, middle | Uruguay | South America | F | Regional Championships World Ranking Event | M | |  |
23 Dec - 26 Dec | Asian Orienteering Championships | Hong Kong China | Asia | F | Regional Championships World Ranking Event | | |  |