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]

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.^[4] The number of participating countries has since risen: 14 countries took part in 1969, 50 in 1989, and 104 in 2009.^[5]

North Korea is the only country whose entire team has been caught cheating, resulting in its disqualification at the 32nd IMO in 1991 and the 51st IMO in 2010.^[6] (However, the 2010 case was controversial.^[7][8]) There have been other disqualifications of contestants due to cheating, but such cases are not officially made public.^[9] In January 2011, Google gave €1 million to the IMO organization to help cover the costs of the events from 2011 to 2015.^[10]

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

#[5]	Venue	Year	Date[5]	Top-ranked country[11]	References
1	Brașov and Bucharest	1959	June 23 – July 31	Romania	[12]
2	Sinaia	1960	July 18 – July 25	Czechoslovakia	[12]
3	Veszprém	1961	July 6 – July 16	Hungary	[12]
4	České Budějovice	1962	July 7 – July 15	Hungary	[12]
5	Warsaw and Wrocław	1963	July 5 – July 13	Soviet Union	[12]
6	Moscow	1964	June 30 – July 10	Soviet Union	[12]
7	East Berlin	1965	June 13 – July 13	Soviet Union	[12]
8	Sofia	1966	July 3 – July 13	Soviet Union	[12]
9	Cetinje	1967	July 7 – July 13	Soviet Union	[12]
10	Moscow	1968	July 5 – July 18	East Germany	[12]
11	Bucharest	1969	July 5 – July 20	Hungary	[12]
12	Keszthely	1970	July 8 – July 22	Hungary	[12]
13	Žilina	1971	July 10 – July 21	Hungary	[12]
14	Toruń	1972	July 5 – July 17	Soviet Union	[12]
15	Moscow	1973	July 5 – July 16	Soviet Union	[12]
16	Erfurt and East Berlin	1974	July 4 – July 17	Soviet Union	[12]
17	Burgas and Sofia	1975	July 3 – July 16	Hungary	[12]
18	Lienz	1976	July 2 – July 21	Soviet Union	[12]
19	Belgrade	1977	July 1 – July 13	United States	[12]
20	Bucharest	1978	July 3 – July 10	Romania	[12]
21	London	1979	June 30 – July 9	Soviet Union	[12]
-	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.	1981	July 8 – July 20	United States	[12]
23	Budapest	1982	July 5 – July 14	West Germany	[12]
24	Paris	1983	July 3 – July 12	West Germany	[12]
25	Prague	1984	June 29 – July 10	Soviet Union	[12]
26	Joutsa	1985	June 29 – July 11	Romania	[12]
27	Warsaw	1986	July 4 – July 15	Soviet Union  United States	[12]
28	Havana	1987	July 5 – July 16	Romania	[12]
29	Sydney and Canberra	1988	July 9 – July 21	Soviet Union	[12]
30	Braunschweig	1989	July 13 – July 24	China	[12]
31	Beijing	1990	July 8 – July 19	China	[12]
32	Sigtuna	1991	July 12 – July 23	Soviet Union	[12][n 1]
33	Moscow	1992	July 10 – July 21	China	[12]
34	Istanbul	1993	July 13 – July 24	China	[12]
35	Hong Kong[n 2]	1994	July 8 – July 20	United States	[12]
36	Toronto	1995	July 13 – July 25	China	[13]
37	Mumbai	1996	July 5 – July 17	Romania	[14]
38	Mar del Plata	1997	July 18 – July 31	China	[15]
39	Taipei	1998	July 10 – July 21	Iran	[16]
40	Bucharest	1999	July 10 – July 22	China  Russia	[17]
41	Daejeon	2000	July 13 – July 25	China	[18]
42	Washington, D.C.	2001	July 1 – July 14	China	[19]
43	Glasgow	2002	July 19 – July 30	China	[20]
44	Tokyo	2003	July 7 – July 19	Bulgaria	[21]
45	Athens	2004	July 6 – July 18	China	[22]
46	Mérida	2005	July 8 – July 19	China	[23]
47	Ljubljana	2006	July 6 – July 18	China	[24]
48	Hanoi	2007	July 19 – July 31	Russia	[25]
49	Madrid	2008	July 10 – July 22	China	[26]
50	Bremen	2009	July 10 – July 22	China	[27]
51	Astana	2010	July 2 – July 14	China	[28]
52	Amsterdam	2011	July 13 – July 24	China	[29]
53	Mar del Plata	2012	July 4 – July 16	South Korea	[30]
54	Santa Marta	2013	July 18 – July 28	China	[31]
55	Cape Town	2014	July 3 – July 13	China	[32]
56	Chiang Mai	2015	July 4 – July 16	United States	[33]
57	Hong Kong	2016	July 6 – July 16	United States	[34]
58	Rio de Janeiro	2017	July 12 – July 23	South Korea	[35]
59	Cluj-Napoca	2018	July 3 – July 14	United States	[36]
60	Bath	2019	July 11 – July 22	China  United States	[37]
61	St. Petersburg (online)[n 3][n 4]	2020	September 19 – September 28	China	[41][42]
62	St. Petersburg (online)[n 5][n 4]	2021	July 14 – July 24	China	[44]
63	Oslo (hybrid)	2022	July 6 – July 16	China	[45]
64	Chiba	2023	July 2 – July 13	China	[46]
65	Bath[n 6]	2024	July 11 – July 22	United States	[48]
66	Sunshine Coast	2025	July 10 – July 20	TBD	[49]
67	Shanghai	2026	TBD	TBD	[50]
68	(TBA)	2027	TBD	TBD	[51]
69	(TBA)	2028	TBD	TBD	[52]

See also

• Asian Pacific Mathematics Olympiad
• Provincial Mathematical Olympiad
• List of mathematics competitions
• List of International Mathematical Olympiad participants

Notes

1. 1991 marked the Soviet Union's last participation. From 1992, former Soviet Union countries – including Russia – entered separately.^[11]
2. At the time of the Olympiad, Hong Kong was under British colonial rule.
3. Following the COVID-19 pandemic, the 2020 IMO was postponed from July to September hoping to keep the competition in-person. Then it was changed to a virtual event.^[38]
4. For the two virtual IMOs, all problems were selected by the Problem Selection Committee instead of the Jury made up of all team leaders, and problems were sent to the team leaders shortly before the exams for translation. Each team took the IMO exam at a national exam centre, and starting times of all exams were in the interval between 07:30 and 12:00 UTC (both ends included) of each exam day. An IMO Commissioner of another nationality was present at each centre to oversee the whole exam, and the IMO Chief Invigilator monitored all exams using webcams.^[39][40]
5. The 2021 IMO was originally to be held in Washington D.C., US. The US gave up hosting after the COVID-19 pandemic had started.^[43][38]
6. The originally determined location for hosting the 2024 IMO was Ukraine. Due to the recent conflicts between the country and Russia, the location was changed to Bath, in which the 2019 IMO was hosted.^[47]

References

1. Unofficial events were held in Finland and Luxembourg in 1980. "UK IMO register". IMO register. Archived from the original on 2001-10-16. Retrieved 2011-06-17.
2. "More IMO Facts". Archived from the original on 2001-08-20. Retrieved 2008-03-05.
3. "Singapore International Mathematical Olympiad (SIMO) Home Page". Singapore Mathematical Society. Archived from the original on 2003-03-27. Retrieved 2008-02-04.
4. "1st IMO 1959". International Mathematical Olympiad. Archived from the original on 2011-09-25. Retrieved 2011-06-20.
5. "Timeline". International Mathematical Olympiad. Archived from the original on 2007-10-11. Retrieved 2011-06-20.
6. "International Mathematical Olympiad: Democratic People's Republic of Korea". Archived from the original on 2007-10-12. Retrieved 2010-07-17.
7. Geoff Smith. "International Mathematical Olympiad 2010 UK leader's report, Almaty and Astana, Kazakhstan". UK IMO Register. Archived from the original on 2023-09-04. Retrieved 2023-09-06.
8. "North Korea's disqualification at IMO 2010". Art of Problem Solving. Archived from the original on 2023-10-21. Retrieved 2023-09-06.
9. Adam McBride. "34th International Mathematical Olympiad, Istanbul, Turkey, UK leader's report". UK IMO Register. Archived from the original on 2023-09-04. Retrieved 2023-11-24.
10. Google Europe Blog: Giving young mathematicians the chance to shine Archived 2016-03-08 at the Wayback Machine. Googlepolicyeurope.blogspot.com (2011-01-21). Retrieved on 2013-10-29.
11. "Ranking of countries". International Mathematical Olympiad. Archived from the original on 2017-08-04. Retrieved 2011-06-20.
12. "US teams at the IMO". Mathematical Association of America. Archived from the original on 2011-07-27. Retrieved 2011-06-19.
13. "IMO 1995". Canadian Mathematical Society. Archived from the original on 2008-02-29. Retrieved 2008-03-17.
14. "IMO 1996". Canadian Mathematical Society. Archived from the original on 2008-02-23. Retrieved 2008-03-17.
15. "IMO 1997" (in Spanish). Argentina. Archived from the original on 1998-12-05. Retrieved 2008-03-17.
16. "IMO 1998". Republic of China. Archived from the original on 1998-12-05.
17. "IMO 1999". Canadian Mathematical Society. Archived from the original on 2008-02-23. Retrieved 2008-03-17.
18. "IMO 2000". Wolfram. Archived from the original on 2001-07-01. Retrieved 2008-03-17.
19. "IMO 2001". Canadian Mathematical Society. Archived from the original on 2011-05-18. Retrieved 2008-03-17.
20. Andreescu, Titu (2004). USA & International Mathematical Olympiads 2002. Mathematical Association of America. ISBN 978-0-88385-815-8.
21. "IMO 2003". Japan. Archived from the original on 2008-03-06. Retrieved 2008-03-17.
22. "IMO 2004". Greece. Archived from the original on 2004-06-27.
23. "IMO 2005". Mexico. Archived from the original on 2005-07-11.
24. "IMO 2006". Slovenia. Archived from the original on 2009-02-28. Retrieved 2008-03-17.
25. "IMO 2007". Vietnam. Archived from the original on 2009-02-12. Retrieved 2008-03-17.
26. "IMO 2008". Spain. Archived from the original on 2008-02-26. Retrieved 2008-03-17.
27. "IMO 2009" (in German). Germany. Archived from the original on 2013-06-05. Retrieved 2008-03-17.
28. "51st IMO 2010". IMO. Archived from the original on 2007-12-13. Retrieved 2011-07-22.
29. "52nd IMO 2011". IMO. Archived from the original on 2007-12-13. Retrieved 2011-07-22.
30. "53rd IMO 2012". IMO. Archived from the original on 2008-07-24. Retrieved 2011-07-22.
31. "54th International Mathematical Olympiad". Universidad Antonio Nariño. Archived from the original on January 21, 2013. Retrieved July 20, 2012.
32. "55th IMO 2014". IMO. Archived from the original on 2011-10-14. Retrieved 2016-09-10.
33. "56th IMO 2015". IMO. Archived from the original on 2011-10-14. Retrieved 2016-09-10.
34. "57th IMO 2016". IMO. Archived from the original on 2012-10-13. Retrieved 2016-09-10.
35. "58th IMO 2017". IMO. Archived from the original on 2012-10-13. Retrieved 2016-09-10.
36. "59th IMO 2018". IMO. Archived from the original on 2014-08-29. Retrieved 2016-09-10.
37. "60th IMO 2019". IMO. Archived from the original on 2014-10-07. Retrieved 2016-09-10.
38. "Virtual IMO 2020 – Russia". International Mathematical Olympiad Foundation. 2020-07-11. Archived from the original on 2023-06-09. Retrieved 2022-07-16.
39. "IMO 2020 (Virtual) Annual Regulations (June 2020)" (PDF). Archived (PDF) from the original on 2020-06-30.
40. "IMO 2021 (Virtual) Annual Regulations (May 5 2021)" (PDF). Archived from the original (PDF) on 2021-07-12.
41. "61st IMO 2020". IMO. Archived from the original on 2016-09-23. Retrieved 2020-11-10.
42. "Annual Regulations for IMO 2020" (PDF). Archived (PDF) from the original on 2020-04-21. Retrieved 2020-04-22.
43. "Original IMO 2021 site". Archived from the original on 2020-04-22.
44. "62nd IMO 2021". IMO. Archived from the original on 2020-10-19. Retrieved 2016-11-17.
45. "63rd IMO 2022". IMO. Archived from the original on 2017-08-02. Retrieved 2017-07-25.
46. "64th IMO 2023". IMO. Archived from the original on 2018-09-09. Retrieved 2018-09-08.
47. "IMO 2024". IMO. Archived from the original on 2022-06-08. Retrieved 2023-07-12.
48. "65th IMO 2024". IMO. Archived from the original on 2022-07-15. Retrieved 2022-06-11.
49. "66th IMO 2025". IMO. Archived from the original on 2020-07-01. Retrieved 2024-02-24.
50. "67th IMO 2026". IMO. Archived from the original on 2023-07-12. Retrieved 2023-06-30.
51. "68th IMO 2027". IMO. Archived from the original on 2024-01-07. Retrieved 2024-01-15.
52. "69th IMO 2028". IMO. Archived from the original on 2024-08-25. Retrieved 2024-08-31.

Bibliography

• Olson, Steve (2004). Count Down. Houghton Mifflin. ISBN 0-618-25141-3.
• Lord, Mary (July 23, 2001). "Michael Jordans of math – U.S. Student whizzes stun the cipher world". U.S. News & World Report. 131 (3): 26.

External links

• Official IMO site Archived 2016-06-17 at the Wayback Machine
• International Mathematical Olympiad Info Page Archived 2015-05-26 at the Wayback Machine at Mathematical Association of America