International Mathematical Olympiad

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The logo of the International Mathematical Olympiad.

The International Mathematical Olympiad (IMO) is a six-question two-day math competition for students that have not yet gone to college and are under 20 years old. Any country may take part in it by sending a team of six students to compete.

History[change | change source]

The IMO has been held every year since 1959. It takes place in a different country (which is called the "host country") from year to year. However, it is often seen that this competition is dominated by the US and China.

Venue Year Date Top-ranked country[1] Refs
Romania Brașov and Bucharest 1959 July 21 – July 31  Romania [2]
Romania Sinaia 1960 July 18 – July 26  Czechoslovakia [2]
Hungary Veszprém 1961 July 6 – July 16  Hungary [2]
Czechoslovakia České Budějovice 1962 July 7 – July 15 [2]
Poland Warsaw and Wrocław 1963 July 5 – July 13  Soviet Union [2]
Soviet Union Moscow 1964 June 30 – July 10 [2]
East Germany East Berlin 1965 July 3 – July 13 [2]
Bulgaria Sofia 1966 July 1 – July 14 [2]
Socialist Federal Republic of Yugoslavia Cetinje 1967 July 2 – July 13 [2]
10  Soviet Union Moscow 1968 July 5 – July 18  East Germany [2]
11  Romania Bucharest 1969 July 5 – July 20  Hungary [2]
12  Hungary Keszthely 1970 July 8 – July 22 [2]
13  Czechoslovakia Žilina 1971 July 10 – July 21 [2]
14  Poland Toruń 1972 July 5 – July 17  Soviet Union [2]
15  Soviet Union Moscow 1973 July 5 – July 16 [2]
16  East Germany Erfurt and East Berlin 1974 July 4 – July 17 [2]
17  Bulgaria Burgas and Sofia 1975 July 3 – July 16  Hungary [2]
18  Austria Lienz 1976 July 7 – July 21  Soviet Union [2]
19  Socialist Federal Republic of Yugoslavia Belgrade 1977 July 1 – July 13  United States [2]
20  Romania Bucharest 1978 July 3 – July 10  Romania [2]
21  United Kingdom London 1979 June 30 – July 9  Soviet Union [2]
  The 1980 IMO was due to be held in Mongolia. It was cancelled, and split into two unofficial events in Europe.[3]
22  United States Washington, D.C. 1981 July 8 – July 20  United States [2]
23  Hungary Budapest 1982 July 5 – July 14  West Germany [2]
24  France Paris 1983 July 1 – July 12 [2]
25  Czechoslovakia Prague 1984 June 29 – July 10  Soviet Union [2]
26  Finland Joutsa 1985 June 29 – July 11  Romania [2]
27  Poland Warsaw 1986 July 4 – July 15  Soviet Union
 United States
[2]
28  Cuba Havana 1987 July 5 – July 16  Romania [2]
29  Australia Sydney and Canberra 1988 July 9 – July 21  Soviet Union [2]
30  West Germany Braunschweig 1989 July 13 – July 24  China [2]
31  China Beijing 1990 July 8 – July 19 [2]
32  Sweden Sigtuna 1991 July 12 – July 23  Soviet Union [2]
33  Russia Moscow 1992 July 10 – July 21  China [2]
34  Turkey Istanbul 1993 July 13 – July 24 [2]
35  Hong Kong Hong Kong 1994 July 8 – July 20  United States [2]
36  Canada Toronto 1995 July 13 – July 25  China [4]
37  India Mumbai 1996 July 5 – July 17  Romania [5]
38  Argentina Mar del Plata 1997 July 18 – July 31  China [6]
39  Taiwan Taipei 1998 July 10 – July 21  Iran [7]
40  Romania Bucharest 1999 July 10 – July 22  China
 Russia
[8]
41  South Korea Daejeon 2000 July 13 – July 25  China [9]
42  United States Washington, D.C. 2001 July 1 – July 14 [10]
43  United Kingdom Glasgow 2002 July 19 – July 30 [11]
44  Japan Tokyo 2003 July 7 – July 19  Bulgaria [12]
45  Greece Athens 2004 July 6 – July 18  China [13]
46  Mexico Mérida 2005 July 8 – July 19 [14]
47  Slovenia Ljubljana 2006 July 6 – July 18 [15]
48  Vietnam Hanoi 2007 July 19 – July 31  Russia [16]
49  Spain Madrid 2008 July 10 – July 22  China [17]
50  Germany Bremen 2009 July 10 – July 22 [18]
51  Kazakhstan Astana 2010 July 2 – July 14 [19]
52  Netherlands Amsterdam 2011 July 12 – July 24 [20]
53  Argentina Mar del Plata 2012 July 4 – July 16  South Korea [21]
54  Colombia Santa Marta 2013 July 18 – July 28  China [22]
55  South Africa Cape Town 2014 July 3 – July 13 [23]
56  Thailand Chiang Mai 2015 July 4 – July 16  United States [24]
57  Hong Kong Hong Kong 2016 July 6 – July 16 [25]
58  Brazil Rio de Janeiro 2017 July 12 – July 23  South Korea [26]
59  Romania Cluj-Napoca 2018 July 3 – July 14  United States [27]
60  United Kingdom Bath 2019 July 11 – July 22  China
 United States
[28]
61  Russia Saint Petersburg 2020 September 19 – September 28  China [29][30][31][32]
62  Russia Saint Petersburg 2021 July 7 – July 17  China [33]
63  Norway Oslo 2022 July 6 – July 16 [34][35]
64  Japan Chiba 2023 July 2 – July 13 [36]
65  Ukraine Ukraine 2024 [37]
66  Australia Melbourne 2025 [38]

Results[change | change source]

The current ten countries with the best all-time results are as follows:[39]

Rank Country Appearances Gold Silver Bronze Honorable Mentions
1  China 36 168 36 6 0
2  United States 47 137 117 29 1
3  Russia 30 106 62 12 0
4  South Korea 34 86 74 28 7
5  Hungary 61 85 168 107 10
6  Romania 62 78 149 110 7
7  Soviet Union[n 1] 29 77 67 45 0
8  Vietnam 45 65 111 78 2
9  Bulgaria 62 55 123 114 13
10  Germany 44 53 105 83 16

References[change | change source]

  1. 1.0 1.1 "Ranking of countries". International Mathematical Olympiad. Retrieved 2011-06-20.
  2. 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 2.11 2.12 2.13 2.14 2.15 2.16 2.17 2.18 2.19 2.20 2.21 2.22 2.23 2.24 2.25 2.26 2.27 2.28 2.29 2.30 2.31 2.32 2.33 2.34 "Historical Record of US Teams". Mathematical Association of America. Archived from the original on 2009-11-28. Retrieved 2011-06-19.
  3. Unofficial events were held in Finland and Luxembourg in 1980. "UK IMO register". IMO register. Retrieved 2011-06-17.
  4. "IMO 1995". Canadian Mathematical Society. Archived from the original on 2008-02-29. Retrieved 2008-03-17.
  5. "IMO 1996". Canadian Mathematical Society. Archived from the original on 2008-02-23. Retrieved 2008-03-17.
  6. "IMO 1997" (in Spanish). Argentina. Retrieved 2008-03-17.
  7. "IMO 1998". Republic of China. Archived from the original on 1998-12-05.
  8. "IMO 1999". Canadian Mathematical Society. Archived from the original on 2008-02-23. Retrieved 2008-03-17.
  9. "IMO 2000". Wolfram. Retrieved 2008-03-17.
  10. "IMO 2001". Canadian Mathematical Society. Archived from the original on 2011-05-18. Retrieved 2008-03-17.
  11. Andreescu, Titu (2004). USA & International Mathematical Olympiads 2002. Mathematical Association of America. ISBN 978-0-88385-815-8.
  12. "IMO 2003". Japan. Archived from the original on 2008-03-06. Retrieved 2008-03-17.
  13. "IMO 2004". Greece. Archived from the original on 2004-06-27.
  14. "IMO 2005". Mexico. Archived from the original on 2005-07-11.
  15. "IMO 2006". Slovenia. Archived from the original on 2009-02-28. Retrieved 2008-03-17.
  16. "IMO 2007". Vietnam. Archived from the original on 2009-02-12. Retrieved 2008-03-17.
  17. "IMO 2008". Spain. Archived from the original on 2008-02-26. Retrieved 2008-03-17.
  18. "IMO 2009" (in German). Germany. Retrieved 2008-03-17.
  19. "51st IMO 2010". IMO. Retrieved 2011-07-22.
  20. "52nd IMO 2011". IMO. Retrieved 2011-07-22.
  21. "53rd IMO 2012". IMO. Retrieved 2011-07-22.
  22. "54th International Mathematical Olympiad". Universidad Antonio Nariño. Archived from the original on January 21, 2013. Retrieved July 20, 2012.
  23. "55th IMO 2014". IMO. Retrieved 2016-09-10.
  24. "56th IMO 2015". IMO. Retrieved 2016-09-10.
  25. "57th IMO 2016". IMO. Retrieved 2016-09-10.
  26. "58th IMO 2017". IMO. Retrieved 2016-09-10.
  27. "59th IMO 2018". IMO. Retrieved 2016-09-10.
  28. "60th IMO 2019". IMO. Retrieved 2016-09-10.
  29. Becomes a virtual event due to COVID-19 pandemic.
  30. "61st IMO 2020". IMO. Retrieved 2016-09-10.
  31. "61st IMO 2020". Retrieved 2018-12-25.
  32. "Annual Regulations for IMO 2020" (PDF). Imo2020.ru. Retrieved 8 November 2021.
  33. "62nd IMO 2021 Result Table". Imo-official.org. Retrieved 2021-11-08.
  34. "63rd IMO 2022". IMO. Retrieved 2017-07-25.
  35. "63rd IMO 2020". Department of Mathematics, University of Os. Retrieved 2018-12-25.
  36. "64rd IMO 2023". IMO. Retrieved 2019-07-22.
  37. "65th IMO 2024". IMO. Retrieved 2021-07-17.
  38. "66rd IMO 2025". IMO. Retrieved 2019-07-22.
  39. "Results: Cumulative Results by Country". Imo-official.org. Retrieved 2016-07-20.
Notes
  1. The Soviet Union participated the IMO for the last time in 1991. From 1992, former Soviet countries – including Russia – entered separately.[1]