International Mathematical Olympiad

The International Mathematical Olympiad (IMO) is an annual contest for high school students. It is the oldest of the international science olympiads.

Past IMOs

Sources differ about the cities hosting some of the early IMOs. This may be partly because leaders are generally housed well away from the students, and partly because after the competition the students did not always stay based in one city for the rest of the IMO. The exact dates cited may also differ, because of leaders arriving before the students, and at more recent IMOs the IMO Advisory Board arriving before the leaders.

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• The 1st IMO was held in Brasov and Bucharest, Romania in 1959.
• The 2nd IMO was held in Sinaia, Romania in 1960.
• The 3rd IMO was held in Veszprém, Hungary in 1961.
• The 4th IMO was held in Ceske Budejovice, Czechoslovakia in 1962.
• The 5th IMO was held in Warsaw and Wroclaw, Poland in 1963.
• The 6th IMO was held in Moscow, USSR in 1964.
• The 7th IMO was held in Berlin, German Democratic Republic in 1965.
• The 8th IMO was held in Sofia, Bulgaria in 1966.
• The 9th IMO was held in Cetinje, Yugoslavia in 1967.
• The 10th IMO was held in Moscow, USSR in 1968.
• The 11th IMO was held in Bucharest, Romania in 1969.
• The 12th IMO was held in Keszthely, Hungary in 1970.
• The 13th IMO was held in Zilina, Czechoslovakia in 1971.
• The 14th IMO was held in Torun, Poland in 1972.
• The 15th IMO was held in Moscow, USSR in 1973.
• The 16th IMO was held in Erfurt and East Berlin, German Democratic Republic in 1974.
• The 17th IMO was held in Burgas and Sofia, Bulgaria in 1975.
• The 18th IMO was held in Lienz, Austria in 1976.
• The 19th IMO was held in Belgrade, Yugoslavia in 1977.
• The 20th IMO was held in Bucharest, Romania in 1978.
• The 21st IMO was held in London, United Kingdom in 1979.
• The 22nd IMO was held in Washington, DC, United States in 1981.
• The 23rd IMO was held in Budapest, Hungary in 1982.
• The 24th IMO was held in Paris, France in 1983.
• The 25th IMO was held in Prague, Czechoslovakia in 1984.
• The 26th IMO was held in Joutsa, Finland in 1985.
• The 27th IMO was held in Warsaw, Poland in 1986.
• The 28th IMO was held in Havana, Cuba in 1987.
• The 29th IMO was held in Canberra, Australia in 1988.
• The 30th IMO was held in Brunswick, Federal Republic of Germany in 1989.
• The 31st IMO was held in Beijing, China in 1990.
• The 32nd IMO was held in Sigtuna, Sweden on 12-23 July, 1991.
• The 33rd IMO was held in Moscow, Russia on 10-21 July, 1992.
• The 34th IMO was held in Istanbul, Turkey on 13-24 July, 1993.
• The 35th IMO was held in Hong Kong on 8-20 July, 1994.
• The 36th IMO was held in Toronto, Canada on 13-25 July, 1995. http://imo.math.ca/IMO95/
• The 37th IMO was held in Mumbai, India on 5-17 July, 1996. http://imo.math.ca/IMO96/
• The 38th IMO was held in Mar del Plata, Argentina on 18-31 July, 1997. http://oma.org.ar/imo97/
• The 39th IMO was held in Taipei, Taiwan on 10-21 July, 1998. http://imo.math.ntnu.edu.tw/
• The 40th IMO was held in Bucharest, Romania on 10-22 July, 1999. http://imo.math.ca/IMO99/
• The 41st IMO was held in Taejon, South Korea on 13-25 July, 2000. http://imo.math.ca/IMO2000/
• The 42nd IMO was held in Washington, DC, United States on 1-14 July, 2001. http://imo.wolfram.com/
• The 43rd IMO was held in Glasgow, United Kingdom on 19-30 July, 2002.
• The 44th IMO was held in Tokyo, Japan on 7-19 July, 2003. http://www.imo2003.com/
• The 45th IMO was held in Athens, Greece on 6-18 July, 2004. http://www.imo2004.gr/
• The 46th IMO was held in Mérida, Mexico on 8-19 July, 2005. http://www.imo2005.org/