Countries which have won the International Mathematical Olympiad

There are surprisingly few of them.
Hint: some countries no longer exist.
Countries with the same number of wins are arranged in chronological order of their first win
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Last updated: August 21, 2025
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First submittedOctober 14, 2016
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Average score58.3%
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Wins
Answer
25
China
13
Soviet Union
9
United States
6
Hungary
5
Romania
2
Germany
2
South Korea
1
Czechoslovakia
1
East Germany
1
Iran
1
Bulgaria
1
Russia
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6 Comments
+1
Level 72
Jul 29, 2018
Great quiz! The USA has won the 59th IMO so their number should now be 7.
+1
Level 63
Jul 29, 2018
Thanks! I've updated the quiz. Kind of forgot that I had a quiz to update when the results came out.
+2
Level 79
Sep 25, 2022
Seeing the whole eastern bloc as the answers i missed was a real shocker.
+1
Level 73
Sep 25, 2022
You should read the description
+2
Level 88
Sep 25, 2022
I don't think you want all that stuff preceding "imo-official.org" in your source link, do you?
+1
Level 63
Sep 30, 2022
Oops, looks like html didn't work like how I thought it did. It's fixed now. Thanks!