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Participants

As of the 2020 Summer Games in Tokyo, all of the current 207 NOCs (and 19 obsolete NOCs) have participated in at least one edition of the Summer Olympics. Competitors from five nations— Australia, France, Great Britain, Greece, and Switzerland —have competed in all 28 Summer Olympics. Athletes competing under the Olympic flag, Mixed Teams and the Refugee Team have competed at six Summer Olympics Games.

A total of 119 NOCs (110 of the current 207 NOCs, and nine obsolete NOCs) have participated in at least one edition of the Winter Olympics. Competitors from 12 nations — Austria, Canada, Finland, France, Great Britain, Hungary, Italy, Norway, Poland, Sweden, Switzerland, and the United States — have participated in all 23 Winter Games to date.