International Mathematical Olympiad

IMO 2025 IMO logo IMO 2026

Timeline

# Year Country City Date Countries Contestants
All M F
70 2029 Mongolia Ulaanbaatar
69 2028 Saudi Arabia TBA
68 2027 Hungary TBA
67 2026 People's Republic of China Shanghai 10.7. - 21.7.
66 2025 Australia Sunshine Coast 10.7. - 20.7. 116 630 555 69
65 2024 United Kingdom Bath 11.7. - 22.7. 114 609 528 81
64 2023 Japan Chiba 2.7. - 13.7. 118 618 550 67
63 2022 Norway Oslo 6.7. - 16.7. 110 589 521 68
62 2021 Russian Federation A distributed IMO administered from St Petersburg 14.7. - 24.7. 107 619 555 64
61 2020 Russian Federation A distributed IMO administered from St Petersburg 19.9. - 28.9. 105 616 560 56
60 2019 United Kingdom Bath 11.7. - 22.7. 112 621 556 65
59 2018 Romania Cluj-Napoca 3.7. - 14.7. 107 593 535 59
58 2017 Brazil Rio de Janeiro 12.7. - 23.7. 111 615 553 62
57 2016 Hong Kong Hong Kong 6.7. - 16.7. 109 602 531 71
56 2015 Thailand Chiang Mai 4.7. - 16.7. 104 577 525 52
55 2014 South Africa Cape Town 3.7. - 13.7. 101 560 504 56
54 2013 Colombia Santa Marta 18.7. - 28.7. 97 527 475 52
53 2012 Argentina Mar del Plata 4.7. - 16.7. 100 547 496 51
52 2011 Netherlands Amsterdam 12.7. - 24.7. 101 563 506 57
51 2010 Kazakhstan Astana 2.7. - 14.7. 95 516 469 47
50 2009 Germany Bremen 10.7. - 22.7. 104 565 506 59
49 2008 Spain Madrid 10.7. - 22.7. 97 535 480 55
48 2007 Vietnam Hanoi 19.7. - 31.7. 93 520 471 49
47 2006 Slovenia Ljubljana 6.7. - 18.7. 90 498 460 38
46 2005 Mexico Mérida 8.7. - 19.7. 91 512 469 43
45 2004 Greece Athens 6.7. - 18.7. 85 485 351 37
44 2003 Japan Tokyo 7.7. - 19.7. 82 456 333 29
43 2002 United Kingdom Glasgow 19.7. - 30.7. 84 479 341 37
42 2001 United States of America Washington 1.7. - 14.7. 83 473 440 33
41 2000 Republic of Korea Taejon 13.7. - 25.7. 82 461 337 31
40 1999 Romania Bucharest 10.7. - 22.7. 81 450 319 37
39 1998 Taiwan Taipeh 10.7. - 21.7. 76 419 298 30
38 1997 Argentina Mar del Plata 18.7. - 31.7. 82 460 318 28
37 1996 India Mumbai 5.7. - 17.7. 75 424 314 25
36 1995 Canada Toronto 13.7. - 25.7. 73 412 305 27
35 1994 Hong Kong Hong Kong 8.7. - 20.7. 69 385 284 26
34 1993 Türkiye Istanbul 13.7. - 24.7. 73 413 297 34
33 1992 Russian Federation Moscow 10.7. - 21.7. 64 351 271 14
32 1991 Sweden Sigtuna 12.7. - 23.7. 55 312 277 17
31 1990 People's Republic of China Beijing 8.7. - 19.7. 54 308 238 12
30 1989 Germany Braunschweig 13.7. - 24.7. 50 291 212 13
29 1988 Australia Canberra 9.7. - 21.7. 49 268 251 17
28 1987 Cuba Havanna 5.7. - 16.7. 42 237 160 7
27 1986 Poland Warsaw 4.7. - 15.7. 34 161 147 7
26 1985 Finland Joutsa 29.6. - 11.7. 38 209 151 7
25 1984 Czechoslovakia Prague 29.6. - 10.7. 34 192 132 3
24 1983 France Paris 1.7. - 12.7. 32 186 178 8
23 1982 Hungary Budapest 5.7. - 14.7. 30 119 87 3
22 1981 United States of America Washington 8.7. - 20.7. 25 172 155 9
21 1979 United Kingdom London 30.6. - 9.7. 23 166 116 1
20 1978 Romania Bucharest 3.7. - 10.7. 17 132 112 3
19 1977 Yugoslavia Belgrade 1.7. - 13.7. 21 155 132 2
18 1976 Austria Lienz 7.7. - 21.7. 18 139 117 4
17 1975 Bulgaria Burgas 3.7. - 16.7. 17 135 99 2
16 1974 German Democratic Republic Erfurt 4.7. - 17.7. 18 140 124 2
15 1973 Union of Soviet Socialist Republics Moscow 5.7. - 16.7. 16 125 115 2
14 1972 Poland Toruń 5.7. - 17.7. 14 107 90 2
13 1971 Czechoslovakia Žilina 10.7. - 21.7. 15 115 98 4
12 1970 Hungary Keszthely 8.7. - 22.7. 14 112 94 5
11 1969 Romania Bucharest 5.7. - 20.7. 14 112 95 6
10 1968 Union of Soviet Socialist Republics Moscow 5.7. - 18.7. 12 96 88
9 1967 Yugoslavia Cetinje 2.7. - 13.7. 13 99 82 1
8 1966 Bulgaria Sofia 1.7. - 14.7. 9 72 59 1
7 1965 German Democratic Republic Berlin 3.7. - 13.7. 10 80 63 9
6 1964 Union of Soviet Socialist Republics Moscow 30.6. - 10.7. 9 72 54 4
5 1963 Poland Wrocław 5.7. - 13.7. 8 64 53 2
4 1962 Czechoslovakia České Budějovice 7.7. - 15.7. 7 56 48 4
3 1961 Hungary Veszprém 6.7. - 16.7. 6 48 34 5
2 1960 Romania Sinaia 18.7. - 26.7. 5 39 32 1
1 1959 Romania Braşov 21.7. - 31.7. 7 52 41 6