◄ 21st IPHO 1990 ►
Country results • Individual results
| Contestant | Country | Rank | Award |
|---|---|---|---|
| Alexander H. Barnett | United Kingdom | 1 |  Gold Medal |
| Carsten Deus | German Democratic Republic | 2 | Gold Medal |
| Vadim Kuzmenko | Union of Soviet Socialist Republics | 3 | Gold Medal |
| Cezary Śliwa | Poland | 4 | Gold Medal |
| Min-Yang Wu | People's Republic of China | 5 | Gold Medal |
| Gang Zhou | People's Republic of China | 6 | Gold Medal |
| Horatiu Stefan Nastase | Romania | 7 |  Silver Medal |
| Sergei Shinkevich | Union of Soviet Socialist Republics | 8 | Silver Medal |
| Wei Yang | People's Republic of China | 9 | Silver Medal |
| Robert Kiendl | Germany | 10 | Silver Medal |
| Vasilij Ivanov | Union of Soviet Socialist Republics | 11 | Silver Medal |
| Alexander Smola | Germany | 12 | Silver Medal |
| Werner Torsten | German Democratic Republic | 13 | Silver Medal |
| Volker Springel | Germany | 14 | Silver Medal |
| Cvetan Cheshkov | Bulgaria | 15 | Silver Medal |
| Diar Tchokin | Union of Soviet Socialist Republics | 16 | Silver Medal |
| Philip Armitage | United Kingdom | 17 | Silver Medal |
| Hans-Peter Storr | German Democratic Republic | 18 | Silver Medal |
| Eduardo Ariel Menedez Proupin | Cuba | 19 |  Bronze Medal |
| Jens Lang | Germany | 20 | Bronze Medal |
| Matthias Bochtler | Germany | 21 | Bronze Medal |
| Bo-You Chen | People's Republic of China | 22 | Bronze Medal |
| Chu Toan Thang | Vietnam | 23 | Bronze Medal |
| Pieter-Tjerk de Boer | Netherlands | 24 | Bronze Medal |
| Dylan Thurston | United States of America | 25 | Bronze Medal |
| János Rékási | Hungary | 26 | Bronze Medal |
| Krzysztof Bobrowski | Poland | 27 | Bronze Medal |
| Nikolai Darmenov | Bulgaria | 28 | Bronze Medal |
| Jonathan Higa | United States of America | 29 | Bronze Medal |
| Yang Chang Huei | Singapore | 30 | Bronze Medal |
| Ákos Csilling | Hungary | 31 | Bronze Medal |
| Nichail Entin | Union of Soviet Socialist Republics | 32 | Bronze Medal |
| Jan Macháček | Czechoslovakia | 33 | Bronze Medal |
| Zhi-Yong Duan | People's Republic of China | 34 | Bronze Medal |
| Ivailo Velichkov | Bulgaria | 35 | Bronze Medal |
| John Wiltshire | Australia | 36 | Bronze Medal |
| Martin Harz | German Democratic Republic | 37 | Bronze Medal |
| Michał Rams | Poland | 38 | Bronze Medal |
| Juan Pablo Gonzalez | Colombia | 39 | Bronze Medal |
| Lars Larsson-Cohn | Sweden | 40 | Bronze Medal |
| Sali Haji Miri | Islamic Republic of Iran | 41 | Bronze Medal |
| Gerardo Ballabio | Italy | 42 | Bronze Medal |
| András Boncz | Hungary | 43 | Bronze Medal |
| Andrew J. Gray | United Kingdom | 44 |  Honourable Mention
|
| Han-Kwang Nienhuys | Netherlands | 45 | Honourable Mention
|
| Lucian Cornel Crasovan | Romania | 46 | Honourable Mention
|
| Igor Passchier | Netherlands | 47 | Honourable Mention
|
| Nicolae Codrin Ciona | Romania | 48 | Honourable Mention
|
| Romuald Janik | Poland | 49 | Honourable Mention
|
| Michael T. Green | United Kingdom | 50 | Honourable Mention
|
| Keith Brain | Australia | 51 | Honourable Mention
|
| Karel Netočný | Czechoslovakia | 52 | Honourable Mention
|
| Christoph Gadermaier | Austria | 53 | Honourable Mention
|
| Martin Oettel | German Democratic Republic | 54 | Honourable Mention
|
| Roger Bergs | Netherlands | 55 | Honourable Mention
|
| Perry Cheng | United States of America | 56 | Honourable Mention
|
| Brett Meyers | Australia | 57 | Honourable Mention
|
| István Németh | Hungary | 58 | Honourable Mention
|
| Valentin Kostov | Bulgaria | 59 | Honourable Mention
|
| Petr Tobiška | Czechoslovakia | 60 | Honourable Mention
|
| Mehmet Aktuna | Türkiye | 61 | Honourable Mention
|
| Esa Tarvainen | Finland | 62 | Honourable Mention
|
| Ciro Cattuto | Italy | 63 | Honourable Mention
|
| Matthew S. Horritt | United Kingdom | 64 | Honourable Mention
|
| Gilles Vissenberg | Netherlands | 65 | Honourable Mention
|
| Kristján Leósson | Iceland | 66 | Honourable Mention
|
| Martin Zeindl | Austria | 67 | Honourable Mention
|
Results may be incomplete or incorrect.
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