The International Olympic Committee (IOC) allocates three-letter country codes to all National Olympic Committees and other groups competing in the Olympic Games. For historical reasons, many of these are different to the standard ISO 3166-1 codes.

 AFG Afghanistan AHO Netherlands Antilles ALB Albania ALG Algeria AND Andorra ANG Angola ANT Antigua and Barbuda ASA American Samoa ARG Argentina ARM Armenia ARU Aruba AUS Australia AUT Austria AZE Azerbaijan BAH The Bahamas BAN Bangladesh BAR Barbados BDI Burundi BEL Belgium BEN Benin BER Bermuda BHU Bhutan BIH Bosnia Herzegovina BIZ Belize BLR Belarus BOL Bolivia BOT Botswana BRA Brazil BRN Bahrain BRU Brunei Darussalam BUL Bulgaria BUR Burkina Faso CAF Central African Republic CAM Cambodia CAN Canada CAY Cayman Islands CGO Republic of the Congo CHA Chad CHI Chile CHN People's Republic of China CIV Côte d'Ivoire (also known commonly as the Ivory Coast) CMR Cameroon COD Democratic Republic of the Congo (formerly known as Zaire) COK Cook Islands COL Colombia COM Comoros CPV Cape Verde CRC Costa Rica CRO Croatia CUB Cuba CYP Cyprus CZE Czech Republic DEN Denmark DJI Djibouti DMA Dominica DOM Dominican Republic ECU Ecuador EGY Egypt ERI Eritrea ESA El Salvador ESP Spain EST Estonia ETH Ethiopia FIJ Fiji FIN Finland FRA France FSM Federated States of Micronesia GAB Gabon GAM The Gambia GBR Great Britain and Northern Ireland (United Kingdom) GBS Guinea-Bissau GEO Georgia GEQ Equatorial Guinea GER Germany GHA Ghana GRE Greece GRN Grenada GUA Guatemala GUI Guinea GUM Guam GUY Guyana HAI Haiti HKG Hong Kong, China HON Honduras HUN Hungary INA Indonesia IND India IRI Islamic Republic of Iran IRL Ireland IRQ Iraq ISL Iceland ISR Israel ISV U.S. Virgin Islands ITA Italy IVB British Virgin Islands JAM Jamaica JOR Jordan JPN Japan KAZ Kazakhstan KEN Kenya KIR Kiribati KGZ Kyrgyzstan KOR South Korea KSA Saudi Arabia KUW Kuwait LAO Laos LAT Latvia LBA Libya LBR Liberia LCA Saint Lucia LES Lesotho LIB Lebanon LIE Liechtenstein LTU Lithuania LUX Luxembourg MAD Madagascar MAR Morocco MAS Malaysia MAW Malawi MDA Moldova MDV Maldives MEX Mexico MGL Mongolia MKD Former Yugoslav Republic of Macedonia MLI Mali MLT Malta MON Monaco MOZ Mozambique MRI Mauritius MTN Mauritania MYA Myanmar (formerly Burma) NAM Namibia NCA Nicaragua NED Netherlands NEP Nepal NGR Nigeria NIG Niger NOR Norway NRU Nauru NZL New Zealand OMA Oman PAK Pakistan PAN Panama PAR Paraguay PER Peru PHI Philippines PLE Palestine PLW Palau PNG Papua New Guinea POL Poland POR Portugal PRK North Korea PUR Puerto Rico QAT Qatar ROM Romania RSA South Africa RUS Russia RWA Rwanda SAM Samoa SCG Serbia and Montenegro (from the Serbian 'Crna Gora' for Montenegro) SEN Senegal SEY Seychelles SIN Singapore SKN Saint Kitts and Nevis SLE Sierra Leone SLO Slovenia SMR San Marino SOL Solomon Islands SOM Somalia SRI Sri Lanka STP São Tomé and Príncipe SUD Sudan SUI Switzerland SUR Suriname SVK Slovakia SWE Sweden SWZ Swaziland SYR Syria TAN Tanzania TGA Tonga THA Thailand TJK Tajikistan TKM Turkmenistan TLS Timor-Leste (also known commonly as East Timor) TOG Togo TPE Chinese Taipei (Republic of China, also known commonly as Taiwan) TRI Trinidad and Tobago TUN Tunisia TUR Turkey UAE United Arab Emirates UGA Uganda UKR Ukraine URU Uruguay USA United States UZB Uzbekistan VAN Vanuatu VEN Venezuela VIE Vietnam VIN Saint Vincent and the Grenadines YEM Yemen ZAM Zambia ZIM Zimbabwe 

Codes no longer used:

 ANZ Australasia (combined Australia and New Zealand team, 1908 and 1912) BOH Bohemia EUN Unified Team (former Soviet Union, 1992) FRG West Germany GDR East Germany TCH Czechoslovakia URS Soviet Union YUG Yugoslavia