List of International Mathematical Olympiads

The first of the International Mathematical Olympiads (IMOs) was held in Romania in 1959. The oldest of the International Science Olympiads, the IMO has since been held annually, except in 1980. That year, the competition initially planned to be held in Mongolia was cancelled due to the Soviet invasion of Afghanistan.[1] Because the competition was initially founded for Eastern European countries participating in the Warsaw Pact, under the influence of the Eastern Bloc,[2] the earlier IMOs were hosted only in Eastern European countries, gradually spreading to other nations.[3] Sources differ about the cities hosting some of the early IMOs and the exact dates when they took place.[4]

Logo of the International Mathematical Olympiad

The first IMO was held in Romania in 1959. Seven countries entered – Bulgaria, Czechoslovakia, East Germany, Hungary, Poland, Romania and the Soviet Union – with the hosts finishing as the top-ranked nation.[5] The number of participating countries has since risen: 14 countries took part in 1969, 50 in 1989, and 104 in 2009.[6]

North Korea is the only country to have been caught cheating, resulting in its disqualification at the 32nd IMO in 1991 and the 51st IMO in 2010.[7] In January 2011, Google gave €1 million to the IMO organization to help cover the costs of the events from 2011–2015.[8]

List of Olympiads
The four perfect scorers in the 2001 IMO. From left to right: Gabriel Carroll, Reid Barton, Zhiqiang Zhang, and Liang Xiao.
The Bangladesh team at the 2009 IMO
Serbia's team for the 2010 IMO
The closing ceremony of the 2015 IMO
#[6] Venue Year Date[6] Top-ranked country[9] References
1  Brașov and Bucharest 1959June 23 – July 31 Romania [10]
2  Sinaia 1960July 18 – July 25 Czechoslovakia [10]
3  Veszprém 1961July 6 – July 16 Hungary [10]
4  České Budějovice 1962July 7 – June 15 Hungary [10]
5  Warsaw and Wrocław 1963July 5 – June 13 Soviet Union [10]
6  Moscow 1964June 30 – July 10 Soviet Union [10]
7  East Berlin 1965June 13 – July 13 Soviet Union [10]
8  Sofia 1966July 3 – July 13 Soviet Union [10]
9  Cetinje 1967July 7 – July 13 Soviet Union [10]
10  Moscow 1968July 5 – July 18 East Germany [10]
11  Bucharest 1969July 5 – July 20 Hungary [10]
12  Keszthely 1970July 8 – July 22 Hungary [10]
13  Žilina 1971July 10 – July 21 Hungary [10]
14  Toruń 1972July 5 – July 17 Soviet Union [10]
15  Moscow 1973July 5 – July 16 Soviet Union [10]
16  Erfurt and East Berlin 1974July 4 – July 17 Soviet Union [10]
17  Burgas and Sofia 1975July 3 – July 16 Hungary [10]
18  Lienz 1976July 2 – July 21 Soviet Union [10]
19  Belgrade 1977July 1 – July 13 United States [10]
20  Bucharest 1978July 3 – July 10 Romania [10]
21  London 1979June 30 – July 9 Soviet Union [10]
-  The 1980 IMO was due to be held in Mongolia. It was cancelled, and split into two unofficial events in Europe.[1]
22  Washington, D.C. 1981July 8 – July 20 United States [10]
23  Budapest 1982July 5 – July 14 West Germany [10]
24  Paris 1983July 3 – July 12 West Germany [10]
25  Prague 1984June 29 – July 10 Soviet Union [10]
26  Joutsa 1985June 29 – July 11 Romania [10]
27  Warsaw 1986July 4 – July 15 Soviet Union
 United States		 [10]
28  Havana 1987July 5 – July 16 Romania [10]
29  Sydney and Canberra 1988July 9 – July 21 Soviet Union [10]
30  Braunschweig 1989July 13 – July 24 China [10]
31  Beijing 1990July 8 – July 19 China [10]
32  Sigtuna 1991July 12 – July 23 Soviet Union [10][n 1]
33  Moscow 1992July 10 – July 21 China [10]
34  Istanbul 1993July 13 – July 24 China [10]
35  Hong Kong[n 2] 1994July 8 – July 20 United States [10]
36  Toronto 1995July 13 – July 25 China [11]
37  Mumbai 1996July 5 – July 17 Romania [12]
38  Mar del Plata 1997July 18 – July 31 China [13]
39  Taipei 1998July 10 – July 21 Iran [14]
40  Bucharest 1999July 10 – July 22 China
 Russia		 [15]
41  Daejeon 2000July 13 – July 25 China [16]
42  Washington, D.C. 2001July 1 – July 14 China [17]
43  Glasgow 2002July 19 – July 30 China [18]
44  Tokyo 2003July 7 – July 19 Bulgaria [19]
45  Athens 2004July 6 – July 18 China [20]
46  Mérida 2005July 8 – July 19 China [21]
47  Ljubljana 2006July 6 – July 18 China [22]
48  Hanoi 2007July 19 – July 31 Russia [23]
49  Madrid 2008July 10 – July 22 China [24]
50  Bremen 2009July 10 – July 22 China [25]
51  Astana 2010July 2 – July 14 China [26]
52  Amsterdam 2011July 13 – July 24 China [27]
53  Mar del Plata 2012July 4 – July 16 South Korea [28]
54  Santa Marta 2013July 18 – July 28 China [29]
55  Cape Town 2014July 3 – July 13 China [30]
56  Chiang Mai 2015July 4 – July 16 United States [31]
57  Hong Kong 2016July 6 – July 16 United States [32]
58  Rio de Janeiro 2017July 12 – July 23 South Korea [33]
59  Cluj-Napoca 2018July 3 – July 14 United States [34]
60  Bath 2019July 11 – July 22  China
 United States		 [35]
61  St. Petersburg 2020September 16 - September 26TBD [36][37]
62  TBD 2021TBDTBD [38][39]
63  Oslo 2022July 6 – July 16TBD [40]
64  Chiba 2023July 2 – July 13TBD [41]
66  Melbourne 2025TBDTBD [42]
gollark: (quaternionic)
gollark: And yet your alleged "memes" are.
gollark: Good, there are no (0) invalid IPs in it.
gollark: Imagine rapidly. 5 seconds remain.
gollark: It's so easy to tell, too.

See also

Notes
  1. 1991 marked the Soviet Union's last participation. From 1992, former Soviet Union countries – including Russia – entered separately.[9]
  2. At the time of the Olympiad, Hong Kong was not possessed by the People's Republic of China.

References
  1. Unofficial events were held in Finland and Luxembourg in 1980. "UK IMO register". IMO register. Retrieved 2011-06-17.
  2. "More IMO Facts". Retrieved 2008-03-05.
  3. "Singapore International Mathematical Olympiad (SIMO) Home Page". Singapore Mathematical Society. Retrieved 2008-02-04.
  4. "Norwegian Students in International Mathematical Olympiad". Archived from the original on 2006-10-20. Retrieved 2008-03-05.
  5. "1st IMO 1959". International Mathematical Olympiad. Retrieved 2011-06-20.
  6. "Timeline". International Mathematical Olympiad. Retrieved 2011-06-20.
  7. "International Mathematical Olympiad: Democratic People's Republic of Korea". Retrieved 2010-07-17.
  8. Google Europe Blog: Giving young mathematicians the chance to shine. Googlepolicyeurope.blogspot.com (2011-01-21). Retrieved on 2013-10-29.
  9. "Ranking of countries". International Mathematical Olympiad. Retrieved 2011-06-20.
  10. "US teams at the IMO". Mathematical Association of America. Archived from the original on 2011-07-27. Retrieved 2011-06-19.
  11. "IMO 1995". Canadian Mathematical Society. Archived from the original on 2008-02-29. Retrieved 2008-03-17.
  12. "IMO 1996". Canadian Mathematical Society. Archived from the original on 2008-02-23. Retrieved 2008-03-17.
  13. "IMO 1997" (in Spanish). Argentina. Retrieved 2008-03-17.
  14. "IMO 1998". Republic of China. Archived from the original on 1998-12-05.
  15. "IMO 1999". Canadian Mathematical Society. Archived from the original on 2008-02-23. Retrieved 2008-03-17.
  16. "IMO 2000". Wolfram. Retrieved 2008-03-17.
  17. "IMO 2001". Canadian Mathematical Society. Archived from the original on 2011-05-18. Retrieved 2008-03-17.
  18. Andreescu, Titu (2004). USA & International Mathematical Olympiads 2002. Mathematical Association of America. ISBN 978-0-88385-815-8.CS1 maint: ref=harv (link)
  19. "IMO 2003". Japan. Archived from the original on 2008-03-06. Retrieved 2008-03-17.
  20. "IMO 2004". Greece. Archived from the original on 2004-06-27.
  21. "IMO 2005". Mexico. Archived from the original on 2005-07-11.
  22. "IMO 2006". Slovenia. Archived from the original on 2009-02-28. Retrieved 2008-03-17.
  23. "IMO 2007". Vietnam. Archived from the original on 2009-02-12. Retrieved 2008-03-17.
  24. "IMO 2008". Spain. Retrieved 2008-03-17.
  25. "IMO 2009" (in German). Germany. Retrieved 2008-03-17.
  26. "51st IMO 2010". IMO. Retrieved 2011-07-22.
  27. "52nd IMO 2011". IMO. Retrieved 2011-07-22.
  28. "53rd IMO 2012". IMO. Retrieved 2011-07-22.
  29. "54th International Mathematical Olympiad". Universidad Antonio Nariño. Archived from the original on January 21, 2013. Retrieved July 20, 2012.
  30. "55th IMO 2014". IMO. Retrieved 2016-09-10.
  31. "56th IMO 2015". IMO. Retrieved 2016-09-10.
  32. "57th IMO 2016". IMO. Retrieved 2016-09-10.
  33. "58th IMO 2017". IMO. Retrieved 2016-09-10.
  34. "59th IMO 2018". IMO. Retrieved 2016-09-10.
  35. "60th IMO 2019". IMO. Retrieved 2016-09-10.
  36. "61st IMO 2020". IMO. Retrieved 2016-09-10.
  37. "Annual Regulations for IMO 2020" (PDF).
  38. Smith, Geoff. "Announcement on IMO2020 and IMO2021". www.facebook.com. Retrieved 2020-06-30.
  39. "62nd IMO 2021". IMO. Retrieved 2016-11-17.
  40. "63rd IMO 2022". IMO. Retrieved 2017-07-25.
  41. "64th IMO 2023". IMO. Retrieved 2018-09-08.
  42. "66th IMO 2025". IMO. Retrieved 2020-06-30.

Bibliography

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