| 3 Jan | Big 5 Orienteering - Day 5 |  South Africa | Africa | F | World Ranking Event | S | |  |
| 6 Jan | O-treff |  Norway | Europe | S | World Ranking Event | M | | |
| 6 Jan | SkidO, OBS-tävling |  Sweden | Europe | S | World Ranking Event | L | | |
| 7 Jan | SkidO, OBS-tävling | Sweden | Europe | S | World Ranking Event | S | | |
| 20 Jan | Czech Championships – sprint |  Czech Republic | Europe | S | World Ranking Event | S | | |
| 21 Jan | NM lang | Norway | Europe | S | World Ranking Event | L | | |
| 21 Jan | Ski-O Long WRE, German Championships, CZE Ranking, SkiO German Cup 5 |  Germany | Europe | S | World Ranking Event | L | | |
| 27 Jan | IV TROFEO MÁXIMUS |  Spain | Europe | F | World Ranking Event | M | | |
| 1 Feb | Egypt International Trail Orienteering Championship 2018 - PreO |  Egypt | Africa | T | World Ranking Event | P | | |
| 2 Feb | Egypt International Trail Orienteering Championship 2018 - TempO | Egypt | Africa | T | World Ranking Event | T | | |
| 2 Feb | Mediterranean Championship in orenteering (MCO2018) | Egypt | Africa | F | World Ranking Event | S | | |
| 3 Feb | Mediterranean Championship in orenteering (MCO2018) | Egypt | Africa | F | World Ranking Event | M | | |
| 3 Feb | ANTALYA O DAYS |  Turkey | Europe | F | World Ranking Event | L | | |
| 3 Feb - 8 Feb | European Ski Orienteering Championship 2018 and World Cup Round 2 |  Bulgaria | Europe | S | Regional Championships
World Cup
World Ranking Event | | | |
| 3 Feb | Meeting de Orientação Dão Lafões - Satão 2018 |  Portugal | Europe | F | World Ranking Event | M | | |
| 4 Feb - 8 Feb | Junior World Ski Orienteering Championships | Bulgaria | Europe | S | Junior World Championships
World Ranking Event | | | |
| 4 Feb | ANTALYA O DAYS | Turkey | Europe | F | World Ranking Event | S | | |
| 11 Feb | Portugal "O" Meeting 2018 | Portugal | Europe | F | World Ranking Event | L | | |
| 17 Feb | XXX International Trophy Murcia Costa Calida | Spain | Europe | F | World Ranking Event | L | | |
| 18 Feb | PIOM - Penamacor International Orienteering Meeting | Portugal | Europe | F | World Ranking Event | L | | |
| 20 Feb - 25 Feb | FISU World University Ski Orienteering Championships 2018 |  Estonia | Europe | S | World Ranking Event
Partner Event | | | |
| 24 Feb | Walliser Ski-OL Weekend |  Switzerland | Europe | S | World Ranking Event | L | | |
| 24 Feb | LORCA O-MEETING 2018 | Spain | Europe | F | World Ranking Event | S | | |
| 25 Feb | Walliser Ski-OL Weekend | Switzerland | Europe | S | World Ranking Event | L | | |
| 3 Mar | ANDALUCIA O MEETING | Spain | Europe | F | World Ranking Event | S | | |
| 3 Mar | ANDALUCIA O MEETING | Spain | Europe | F | World Ranking Event | M | | |
| 10 Mar | Melbourne Sprint Weekend WRE |  Australia | Oceania | F | World Ranking Event | S | | |
| 10 Mar | Lipica TrailO |  Slovenia | Europe | T | World Ranking Event | P | | |
| 17 Mar | 4ª Liga Española Sprint – Rock’n’O | Spain | Europe | F | World Ranking Event | S | | |
| 17 Mar | Szeged Kupa |  Hungary | Europe | F | World Ranking Event | M | | |
| 18 Mar | 4ª Liga Española – Rock’n’O | Spain | Europe | F | World Ranking Event | M | | |
| 23 Mar | Danish Spring Sprint |  Denmark | Europe | F | World Ranking Event | S | | |
| 24 Mar | Danish Spring Middle | Denmark | Europe | F | World Ranking Event | M | | |
| 25 Mar | Danish Spring Long | Denmark | Europe | F | World Ranking Event | L | | |
| 30 Mar | New Zealand Sprint Distance Orienteering Championships |  New Zealand | Oceania | F | World Ranking Event | S | | |
| 30 Mar | Australian 3-Days, Prologue | Australia | Oceania | F | World Ranking Event | S | | |
| 30 Mar | JK 2018 - Sprint |  Great Britain | Europe | F | World Ranking Event | S | | |
| 31 Mar | New Zealand Long Distance Orienteering Champs | New Zealand | Oceania | F | World Ranking Event | L | | |
| 31 Mar | Australian 3-Days, Day 1 | Australia | Oceania | F | World Ranking Event | M | | |
| 31 Mar | FinTrailO 2018 |  Finland | Europe | T | World Ranking Event | T | | |
| 31 Mar | FinTrailO 2018 | Finland | Europe | T | World Ranking Event | P | | |
| 31 Mar | Ukrainian Championships |  Ukraine | Europe | F | World Ranking Event | M | | |
| 31 Mar | 3 jours de Pâques en Bourgogne-Franche-Comté |  France | Europe | F | World Ranking Event | M | | |
| 31 Mar | JK 2018 - Middle | Great Britain | Europe | F | World Ranking Event | M | | |
| 1 Apr | 3 jours de Pâques en Bourgogne-Franche-Comté | France | Europe | F | World Ranking Event | L | | |
| 1 Apr | JK 2018 - Long | Great Britain | Europe | F | World Ranking Event | L | | |
| 6 Apr | Testlauf Sprint | Switzerland | Europe | F | World Ranking Event | S | | |
| 7 Apr | Cupa Velikden 2018 - Middle | Bulgaria | Europe | F | World Ranking Event | M | | |
| 7 Apr | Blåveissprinten | Norway | Europe | F | World Ranking Event | M | | |
| 7 Apr | MTBO Sprint Italian Campionship & WRE |  Italy | Europe | M | World Ranking Event | S | | |
| 7 Apr | Testlauf Middle | Switzerland | Europe | F | World Ranking Event | M | | |
| 7 Apr | Kurzemes Pavasaris |  Latvia | Europe | F | World Ranking Event | M | | |
| 8 Apr | EM testløp lang (Long distance test competition for EOC) | Norway | Europe | F | World Ranking Event | L | | |
| 8 Apr | First Round MTBO Italian Cup - Middle | Italy | Europe | M | World Ranking Event | M | | |
| 10 Apr | EM testløp sprint | Norway | Europe | F | World Ranking Event | S | | |
| 13 Apr | Swedish League | Sweden | Europe | F | World Ranking Event | S | | |
| 13 Apr | Salming-Sprint | Finland | Europe | F | World Ranking Event | S | | |
| 14 Apr | Metropolis of South East Europe 2018 |  Serbia | Europe | F | World Ranking Event | M | | |
| 14 Apr | Swedish League | Sweden | Europe | F | World Ranking Event | L | | |
| 15 Apr | Ankkurirastit | Finland | Europe | F | World Ranking Event | M | | |
| 15 Apr | Czech Cup - sprint | Czech Republic | Europe | F | World Ranking Event | S | | |
| 15 Apr | Swedish League | Sweden | Europe | F | World Ranking Event | M | | |
| 15 Apr | Open Grodno Cup 2018 |  Belarus | Europe | F | World Ranking Event | S | | |
| 21 Apr | FinnSpring2018 | Finland | Europe | F | World Ranking Event | L | | |
| 21 Apr | Pavasario Taure (Spring Cup) |  Lithuania | Europe | F | World Ranking Event | M | | |
| 21 Apr | Brazilian Orienteering Championships - I Stage |  Brazil | South America | F | World Ranking Event | L | | |
| 21 Apr | Championnat de France de Moyenne Distance | France | Europe | F | World Ranking Event | M | | |
| 22 Apr | Pavasario Taure (Spring Cup) | Lithuania | Europe | F | World Ranking Event | L | | |
| 22 Apr | Brazilian Orienteering Championships - I Stage | Brazil | South America | F | World Ranking Event | M | | |
| 29 Apr | May O-Days 2018 | Belarus | Europe | F | World Ranking Event | M | | |
| 1 May | DM Sprint and World Ranking Event | Sweden | Europe | F | World Ranking Event | S | | |
| 4 May | Tsutsuji matsuri |  Japan | Asia | F | World Ranking Event | M | | |
| 10 May | Schweizer Meisterschaften Sprint SPM | Switzerland | Europe | F | World Ranking Event | S | | |
| 12 May | Ukrainian Championships | Ukraine | Europe | F | World Ranking Event | L | | |
| 12 May | MALAYSIA MYO ASIA CUP 2018 |  Malaysia | Asia | F | World Ranking Event | S | | |
| 19 May | Campionato Italiano Middle | Italy | Europe | F | World Ranking Event | M | | |
| 20 May | Czech Cup - middle | Czech Republic | Europe | F | World Ranking Event | M | | |
| 26 May | Finnish Championships in middle distance | Finland | Europe | F | World Ranking Event | M | | |
| 26 May | Romania Cup & Gaudeamus Cup |  Romania | Europe | F | World Ranking Event | M | | |
| 26 May | Austrian Championships Sprint |  Austria | Europe | F | World Ranking Event | S | | |
| 26 May | Baltic Orienteering Championships | Latvia | Europe | F | World Ranking Event | L | | |
| 26 May | Danish Championships Sprint | Denmark | Europe | F | World Ranking Event | S | | |
| 26 May | Czech Cup - Plzensky sprint | Czech Republic | Europe | F | World Ranking Event | S | | |
| 2 Jun | Czech Championships - sprint | Czech Republic | Europe | M | World Ranking Event | S | | |
| 3 Jun | The 40th competition of UTOLK | Japan | Asia | F | World Ranking Event | L | | |
| 3 Jun | Czech Cup - middle distance | Czech Republic | Europe | M | World Ranking Event | M | | |
| 8 Jun | Latvia MTBO 3-days / Baltic Championships 2018 | Latvia | Europe | M | World Ranking Event | S | | |
| 9 Jun | Latvia MTBO 3-days / Baltic Championships 2018 | Latvia | Europe | M | World Ranking Event | M | | |
| 9 Jun | Sprint Race Tour 2018 - stage 3 | Italy | Europe | F | World Ranking Event | S | | |
| 9 Jun | Finnish Championship MtbO sprint | Finland | Europe | M | World Ranking Event | S | | |
| 10 Jun | Czech Cup - long | Czech Republic | Europe | F | World Ranking Event | L | | |
| 10 Jun | Italian Cup 2018 - stage 5 | Italy | Europe | F | World Ranking Event | M | | |
| 10 Jun | Finnish Championship MtbO long | Finland | Europe | M | World Ranking Event | L | | |
| 16 Jun | Danish Mountainbike orienteering championships Long distance | Denmark | Europe | M | World Ranking Event | L | | |
| 17 Jun | Danish Mountainbike orienteering championships Middle distance | Denmark | Europe | M | World Ranking Event | M | | |
| 17 Jun | Brazilian Orienteering Championships - II Stage | Brazil | South America | F | World Ranking Event | M | | |
| 22 Jun | Norsk O-Festival | Norway | Europe | F | World Ranking Event | S | | |
| 23 Jun | Norsk O-Festival | Norway | Europe | F | World Ranking Event | L | | |
| 23 Jun | Championnat de France de Longue Distance | France | Europe | F | World Ranking Event | L | | |
| 23 Jun - 24 Jun | Czech Championships - middle final (Qualification race on 23rd) | Czech Republic | Europe | F | World Ranking Event | M | | |
| 24 Jun | Norsk O-Festival | Norway | Europe | F | World Ranking Event | M | | |
| 24 Jun | Örebro City Sprint and World Ranking Event | Sweden | Europe | F | World Ranking Event | S | | |
| 27 Jun - 1 Jul | European MTB Orienteering Championships and World Cup Round 1 | Hungary | Europe | M | Regional Championships
World Cup
World Ranking Event | | | |
| 29 Jun | Kapa 3-days (Day 1) | Latvia | Europe | F | World Ranking Event | M | | |
| 30 Jun | ASOM 2018 WRE |  Belgium | Europe | F | World Ranking Event | S | | |
| 30 Jun | Austrian Championships Middle | Austria | Europe | F | World Ranking Event | M | | |
| 9 Jul - 14 Jul | Junior World Orienteering Championships | Hungary | Europe | F | Junior World Championships
World Ranking Event | | | |
| 17 Jul - 21 Jul | FISU World University Orienteering Championships 2018 | Finland | Europe | F | World Ranking Event
Partner Event | | | |
| 21 Jul | Estonian MTBO Championship middle | Estonia | Europe | M | World Ranking Event | M | | |
| 21 Jul | Kopaonik open 2018 |  POSK Jasenica | Europe | F | World Ranking Event | M | | |
| 21 Jul | Sprint Scotland Race 1 | Great Britain | Europe | F | World Ranking Event | S | | |
| 21 Jul | Sprint Scotland Race 2 | Great Britain | Europe | F | World Ranking Event | S | | |
| 22 Jul | Sprint Scotland Race 3 | Great Britain | Europe | F | World Ranking Event | S | | |
| 22 Jul | Estonian MTBO Championship long | Estonia | Europe | M | World Ranking Event | L | | |
| 27 Jul | Tallinn Orienteering Week, WRE-sprint | Estonia | Europe | F | World Ranking Event | S | | |
| 28 Jul | Tallinn Orienteering Week, WRE-middle | Estonia | Europe | F | World Ranking Event | M | | |
| 28 Jul | Austrian Championships Long | Austria | Europe | M | World Ranking Event | L | | |
| 29 Jul | Austrian Cup Middle | Austria | Europe | M | World Ranking Event | M | | |
| 3 Aug | Falco Cup | Lithuania | Europe | T | World Ranking Event | P | | |
| 18 Aug - 21 Aug | North American Orienteering Championships |  Canada | North America | F | Regional Championships
World Ranking Event | | | |
| 19 Aug | Schweizer Meisterschaften Langdistanz LOM | Switzerland | Europe | F | World Ranking Event | L | | |
| 23 Aug | Cerkno Cup / South East European Championships - middle | Slovenia | Europe | F | World Ranking Event | M | | |
| 24 Aug | Cerkno Cup / South East European Championships - long | Slovenia | Europe | F | World Ranking Event | L | | |
| 25 Aug | Finnish Championships in long distance (Qualification on 24:th) | Finland | Europe | F | World Ranking Event | L | | |
| 25 Aug | Cerkno Cup / South East European Championships - sprint | Slovenia | Europe | F | World Ranking Event | S | | |
| 26 Aug | Schweizer Meisterschaften Mitteldistanz MOM | Switzerland | Europe | F | World Ranking Event | M | | |
| 30 Aug - 2 Sep | World Cup round 3 & Pre-WOC | Norway | Europe | F | World Cup
World Ranking Event | | | |
| 8 Sep | Campionato Italiano Sprint | Italy | Europe | F | World Ranking Event | S | | |
| 8 Sep | Queensland Middle Distance Championships | Australia | Oceania | F | World Ranking Event | M | | |
| 8 Sep | Austrian Championships Long | Austria | Europe | F | World Ranking Event | L | | |
| 9 Sep | Campionato Italiano Long | Italy | Europe | F | World Ranking Event | L | | |
| 9 Sep | National Orienteering League Ultralong | Australia | Oceania | F | World Ranking Event | U | | |
| 9 Sep | DM Lang |  Viborg OK | Europe | F | World Ranking Event | L | | |
| 15 Sep | BOM MTBO WRE 2018 - Long | Portugal | Europe | M | World Ranking Event | L | | |
| 16 Sep | BOM MTBO WRE 2018 - Middle | Portugal | Europe | M | World Ranking Event | M | | |
| 16 Sep | Finnish Championships in sprint | Finland | Europe | F | World Ranking Event | S | | |
| 16 Sep | Czech Championships - long distance | Czech Republic | Europe | F | World Ranking Event | L | | |
| 17 Sep | 2018 National Orienteering Championship – Sprint |  China | Asia | F | World Ranking Event | S | | |
| 18 Sep | 2018 National Orienteering Championship – Long | China | Asia | F | World Ranking Event | L | | |
| 18 Sep | Testlauf Sprint | Switzerland | Europe | F | World Ranking Event | S | | |
| 20 Sep | 2018 National Orienteering Championship – Middle | China | Asia | F | World Ranking Event | M | | |
| 21 Sep | Norgescup sprint | Norway | Europe | F | World Ranking Event | S | | |
| 21 Sep - 23 Sep | MTB Orienteering World Cup Round 3 | Portugal | Europe | M | World Cup
World Ranking Event | | | |
| 22 Sep | Norgescup mellom | Norway | Europe | F | World Ranking Event | M | | |
| 29 Sep | Australian Middle Distance Championships | Australia | Oceania | F | World Ranking Event | M | | |
| 29 Sep | XXX Suunto Games | Estonia | Europe | F | World Ranking Event | L | | |
| 1 Oct | Australian Sprint Championships | Australia | Oceania | F | World Ranking Event | S | | |
| 4 Oct - 7 Oct | World Cup Round 4 | Czech Republic | Europe | F | World Cup
World Ranking Event | | | |
| 6 Oct | Prague Trail Autumn | Czech Republic | Europe | T | World Ranking Event | P | | |
| 6 Oct | Australian Long Championships | Australia | Oceania | F | World Ranking Event | L | | |
| 7 Oct | Prague Trail Autumn | Czech Republic | Europe | T | World Ranking Event | T | | |
| 13 Oct | Kinmen Orienteering Championships & WRE 2018 |  Chinese Taipei | Asia | F | World Ranking Event | S | | |
| 13 Oct | 1. Niksar Cup | Turkey | Europe | F | World Ranking Event
National Event | L | | |
| 14 Oct | 1. Niksar Cup | Turkey | Europe | F | World Ranking Event | M | | |
| 23 Oct | Beijing O Week 2018 – Middle | China | Asia | F | World Ranking Event | M | | |
| 27 Oct | Beijing O Week 2018 – Sprint | China | Asia | F | World Ranking Event | S | | |
| 28 Oct | 2 Days of North-West Veluwe 2018 |  Netherlands | Europe | F | World Ranking Event | M | | |
| 2 Nov | 2018 China Elite Orienteering Championships | China | Asia | F | World Ranking Event | S | | |
| 3 Nov | 2018 China Elite Orienteering Championships | China | Asia | F | World Ranking Event | M | | |
| 3 Nov | Championnat de France de Sprint | France | Europe | F | World Ranking Event | S | | |
| 4 Nov | Sprint Race Tour - stage 5 | Italy | Europe | F | World Ranking Event | S | | |
| 5 Nov | 2018 China Elite Orienteering Championships | China | Asia | F | World Ranking Event | L | | |
| 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 | | |
| 15 Dec | Austria Cup & Germany Cup | Germany | Europe | S | World Ranking Event | M | | |
| 15 Dec | Sjusjøenrennet sprint | Norway | Europe | S | World Ranking Event | S | | |
| 16 Dec | Sjusjørennet mellom | Norway | Europe | S | World Ranking Event | M | | |
| 18 Dec | 2018 Guangdong Historical Road Orienteering Championship | China | Asia | F | World Ranking Event | S | | |
| 20 Dec | 2018 Guangdong Historical Road Orienteering Championship | China | Asia | F | World Ranking Event | S | | |
| 23 Dec - 26 Dec | Asian Orienteering Championships |  Hong Kong China | Asia | F | Regional Championships
World Ranking Event | | | |
| 30 Dec | HK Annual Orienteering Championships - Long | Hong Kong China | Asia | F | World Ranking Event | L | | |
