The IOF currently has 75 member federations.
You can find contact details to all federations in IOF Eventor.
| Country | Orienteering Federation | Membership | Membership Group |
| ARG | Argentinian Orienteering Federation | Member | 7 |
| AUS | Orienteering Australia | Member | 3 |
| AUT | Austrian Orienteering Federation | Member | 3 |
| AZE | Orienteering Federation of the Republic of Azerbaijan | Member | 7 |
| BAR | Barbados Orienteering Federation | Member | 7 |
| BEL | Belgian Orienteering Federation | Member | 5 |
| BLR | Belarus Orienteering Federation | Member | 5 |
| BRA | Brazilian Orienteering Confederation | Member | 5 |
| BUL | Bulgarian Orienteering Federation | Member | 4 |
| CAN | The Canadian Orienteering Federation | Member | 4 |
| CHI | The Chilean Orienteering Federation | Member | 7 |
| CHN | Orienteering Association of China | Member | 5 |
| CMR | Association Sportive D’Orientation du Cameroun | Provisional (Suspended) | 7 |
| COL | Colombian Orienteering Federation | Member | 7 |
| CRC | Costa Rican Federation of Orienteering Sports | Provisional | 7 |
| CRO | Croatian Orienteering Federation | Member | 5 |
| CUB | Cuban Orienteering Federation | Member (Suspended) | 7 |
| CZE | Czech Orienteering Federation | Member | 3 |
| CYP | KOMOAA | Member | 6 |
| DEN | Danish Orientering Federration | Member | 2 |
| DOM | Dominican Republic Orienteering Federation | Provisional | 7 |
| ECU | The Orienteering Federation of Ecuador | Member (Suspended) | 7 |
| EGY | Egyptian Orienteering Federation | Member | 7 |
| ESP | Spanish Orienteering Federation | Member | 4 |
| EST | Estonian Orienteering Federation | Member | 4 |
| FIN | Finnish Orienteering Federation | Member | 1 |
| FRA | French Orienteering Federation | Member | 2 |
| GBR | British Orienteering | Member | 2 |
| GEO | Georgian Orienteering Federation | Member | 7 |
| GER | German Orienteering Federation | Member | 3 |
| GRE | Orienteering Committee of the Hellenic Federation of Modern Pentathlon | Member | 7 |
| HKG | Orienteering Association of Hong Kong | Member | 4 |
| HUN | Hungarian Orienteering Federation | Member | 4 |
| INA | Federation Orienteering National of Indonesia | Member | 7 |
| IND | Orienteering Federation of India | Member | 7 |
| IRI | Iranian Federation of Sports Associations | Member | 7 |
| IRL | Irish Orienteering Association | Member | 4 |
| ISR | Israel Sport Orienteering Association | Member | 5 |
| ITA | Italian Orienteering Federation | Member | 3 |
| JPN | Japan Orienteering Association | Member | 5 |
| KAZ | Sport Orienteering Federation of the Republic of Kazakhstan | Member | 7 |
| KGZ | Kyrgyzstan Orienteering Federation | Member | 7 |
| KOR | Korea Orienteering Federation | Member | 6 |
| LAT | Latvian Orienteering Federation | Member | 4 |
| LIE | Liechtenstein Orienteering Club | Member | 7 |
| LTU | Lithuanian Orienteering Federation | Member | 4 |
| MAS | Magnet Edge Orienteering Sports Club Malaysia | Member | 7 |
| MDA | Moldavian Orienteering Federation | Member | 7 |
| MKD | Macedonian Orienteering Federation | Member | 7 |
| MNE | Orienteering Federation of Montenegro | Member (Suspended) | 7 |
| MOZ | Associacao de Orientacao da Cidade de Maputo | Member | 7 |
| NED | Dutch Orienteering Federation | Member | 6 |
| NEP | Nepal Orienteering Federation | Provisional | 7 |
| NOR | Norwegian Orienteering Federation | Member | 1 |
| NZL | New Zealand Orienteering Federation | Member | 4 |
| POL | Polish Orienteering Association | Member | 5 |
| POR | Portuguese Orienteering Federation | Member | 4 |
| PRK | Amateur Orienteering Assoc. of the Democratic People’s Rep. of Korea | Member | 7 |
| ROU | Romanian Orienteering Federation | Member | 6 |
| RSA | The South African Orienteering Federation | Member | 6 |
| RUS | Russian Orienteering Federation | Member | 3 |
| SRB | Serbian Orienteering Federation | Member | 6 |
| SIN | Orienteering Federation Singapore | Member | 7 |
| SLO | Slovenian Orienteering Federation | Member | 6 |
| SUI | Swiss Orienteering | Member | 1 |
| SVK | Slovak Orienteering Association | Member | 5 |
| SWE | Swedish Orienteering Federation | Member | 1 |
| TAI | Thai Orienteering Association | Member | 7 |
| TPE | Chinese Taipei Orienteering Association | Member | 6 |
| TUR | Turkish Orienteering Federation | Member | 5 |
| UGA | Uganda Orienteering Association | Provisional (Suspended) |
7 |
| UKR | Ukrainian Orienteering Federation | Member | 5 |
| URU | Uruguayan Orienteering Federation | Member | 7 |
| USA | United States Orienteering Federation | Member | 4 |
| VEN | Venezuelan Orienteering Federation | Provisional (Suspended) | 7 |