| • IOI Participants 2012 – ITALY | ||||
| Surname | Name | School | Province | Medal Position |
| Moolla | Ashraf | Rondebosch Boys’ High | Western Cape | – |
| Newton | Vaughan | Diocesan College (Bishops) | Western Cape | Bronze |
| Spencer | Robert | Westerford High | Western Cape | – |
| Wentzel | Sean | Westerford High | Western Cape | Bronze |
| • IOI Participants 2011 – THAILAND | ||||
| Surname | Name | School | Province | Medal Position |
| Davies | Kieren | Int. School of Hout Bay | Western Cape | – |
| Hamdulay | Yaseen | Wynberg Boys’ High | Western Cape | – |
| Newton | Vaughan | Diocesan College (Bishops) | Western Cape | Bronze |
| Swart | Bennie | Bellville High | Western Cape | Bronze |
| • IOI Participants 2010 – CANADA | ||||
| Surname | Name | School | Province | Medal Position |
| Conradie | Jacobus Francois | De Kuilen High | Western Cape | Bronze |
| Manuell | Graham | De La Salle College | Gauteng | Bronze |
| Van der Merwe | Jacobus Petrus | Brackenfell High | Western Cape | Bronze |
| Wentzel | Sean | Westerford High | Western Cape | Bronze |
| • IOI Participants 2009 – BULGARIA | ||||
| Surname | Name | School | Province | Medal Position |
| Conradie | Jacobus Francois | De Kuilen High | Western Cape | Bronze |
| Krüger | Schalk-Willem | Ferdinand Postma High | North West | – |
| Manuell | Graham | De La Salle College | Gauteng | – |
| Van der Merwe | Jacobus Petrus | Brackenfell High | Western Cape | – |
| • IOI Participants 2008 – EGYPT | ||||
| Surname | Name | School | Province | Medal Position |
| Danoher | Mark | Pearson High | Eastern Cape | – |
| Ketteringham | Robert | Rondebosch Boys’ High | Western Cape | – |
| Krüger | Schalk-Willem | Ferdinand Postma High | North West | – |
| Moolla | Saadiq | Rondebosch Boys’ High | Western Cape | Bronze |
| • IOI Participants 2007 – CROATIA | ||||
| Surname | Name | School | Province | Medal Position |
| Bradshaw | Charles | Rondebosch Boys’ High | Western Cape | – |
| Coetzee | Dirk-B | Stellenbosch High | Western Cape | Bronze |
| Danoher | Mark | Pearson High | Eastern Cape | – |
| Kistner | Ralf | Paul Roos Gymnasium | Western Cape | Bronze |
| • IOI Participants 2006 – MEXICO | ||||
| Surname | Name | School | Province | Medal Position |
| Carruthers-Smith | Keegan | Pinelands High | Western Cape | Silver |
| Kistner | Ralf | Paul Roos Gymnasium | Western Cape | Silver |
| Rabkin | Max | Cedar House | Western Cape | – |
| Yudaken | Joshua | King David – Linksfield | Gauteng | Silver |
| • IOI Participants 2005 – POLAND | ||||
| Surname | Name | School | Province | Medal Position |
| Carruthers-Smith | Keegan | Pinelands High | Western Cape | – |
| Jansen v Nieuwenhuizen | Allen | Uitsig High | Gauteng | – |
| Stranex | Timothy | Crawford College | KwaZulu-Natal | Bronze |
| Strydom | Migael | Pretoria Boys’ High | Gauteng | – |
| • IOI Participants 2004 – GREECE | ||||
| Surname | Name | School | Province | Medal Position |
| Starfield | Richard | King David – Linksfield | Gauteng | Gold |
| Gallotta | Marco | Rondebosch Boys’ High | Western Cape | – |
| Loots | Linsen | Parel Vallei High | Western Cape | – |
| Pilkington | Nicholas | Hilton College | KwaZulu-Natal | – |
| • IOI Participants 2003 – USA | ||||
| Surname | Name | School | Province | Medal Position |
| Loots | Linsen | Parel Vallei High | Western Cape | Silver |
| Tian | Shen | St David’s Marist Inanda | Gauteng | Bronze |
| Scheepers | Christiaan | Eldoraigne High | Gauteng | – |
| Wiggins | Harry | Worcester Gymnasium | Western Cape | – |
| • IOI Participants 2002 – KOREA | ||||
| Surname | Name | School | Province | Medal Position |
| Conradie | Jacques | De Kuilen High | Western Cape | Bronze |
| Du Toit | Heinrich | Paarl Boys’ High | Western Cape | Bronze |
| Poulter | Graham | Durban High | KwaZulu-Natal | – |
| Wiggins | Harry | Worcester Gymnasium | Western Cape | – |
| • IOI Participants 2001 – FINLAND | ||||
| Surname | Name | School | Province | Medal Position |
| Du Toit | Johan | Paarl Boys’ High | Western Cape | Silver |
| Kroon | Jacob | Die Wilgers High | Gauteng | Bronze |
| Kruger | Kurt | Paarl Boys’ High | Western Cape | – |
| Merry | Bruce | Westerford High | Western Cape | Gold |
| • IOI Participants 2000 – CHINA | ||||
| Surname | Name | School | Province | Medal Position |
| Hultquist | Carl | Hilton College | KwaZulu-Natal | Bronze |
| Merry | Bruce | Westerford High | Western Cape | Gold |
| Penzhorn | Liesl | Afrikaans Girls’ High | Gauteng | Bronze |
| Van der Merwe | Hugo | Paul Roos High | Western Cape | Bronze |
| • IOI Participants 1999 – TURKEY | ||||
| Surname | Name | School | Province | Medal Position |
| Cook | Paul | Crawford College | Gauteng | Bronze |
| Hoft | Rainer | Groote Schuur High | Western Cape | Bronze |
| Hultquist | Carl | Hilton College | KwaZulu-Natal | Silver |
| Merry | Bruce | Westerford High | Western Cape | Silver |
| • IOI Participants 1998 – PORTUGAL | ||||
| Surname | Name | School | Province | Medal Position |
| Cronjé | Jaco | Noordelig School | Gauteng | Bronze |
| Merry | Bruce | Westerford High | Western Cape | Bronze |
| Van Swelm | Brett | Bergvliet High | Western Cape | – |
| Wright | Daniel | St David’s Marist Inanda | Gauteng | Gold – IFIP Trophy |
| • IOI Participants 1997 – SOUTH AFRICA | ||||
| Surname | Name | School | Province | Medal Position |
| Conradie | Danie | Eldoraigne High | Gauteng | Silver |
| Lawrence | Timothy | Hilton College | KwaZulu-Natal | Bronze |
| Merry | Bruce | Westerford High | Western Cape | Bronze |
| Van Esch | Nicholas | Sacred Heart College | Gauteng | – |
| • IOI Participants 1996 – HUNGARY | ||||
| Surname | Name | School | Province | Medal Position |
| Combrink | Jacobus | D.F. Malan High | Western Cape | – |
| Fraser | David | Westerford High | Western Cape | – |
| Isacks | Wesley | George Campbell Tech High | KwaZulu-Natal | – |
| Merry | Bruce | Westerford High | Western Cape | Bronze |
| • IOI Participants 1995 – NETHERLANDS | ||||
| Surname | Name | School | Province | Medal Position |
| Gutter | Jan | Sarel Cilliers High | Free State | – |
| Liu | Kevin | Parktown Boys’ High | Gauteng | Silver |
| Sharples | Shaun | Carter High | KwaZulu-Natal | – |
| Van Rooyen | Gert-Jan | Durbanville High | Western Cape | Bronze |
| • IOI Participants 1994 – SWEDEN | ||||
| Surname | Name | School | Province | Medal Position |
| Kyritsis | Michael | Bergvliet High | Western Cape | – |
| Liu | Kevin | Parktown Boys’ High | Gauteng | Silver |
| Shand | Brian | Diocesan College (Bishops) | Western Cape | Silver |
| Van Rooyen | Gert-Jan | Durbanville High | Western Cape | – |
| • IOI Participants 1993 – ARGENTINA | ||||
| Surname | Name | School | Province | Medal Position |
| Iglauer | Alexis | Deutsche Schule | Gauteng | – |
| Liu | Kevin | Parktown Boys’ High | Gauteng | – |
| Pelpolla | Kavinda | Mmabatho High School | North West | – |
| Tanner-Tremaine | Richard | Westville Boys’ High | KwaZulu-Natal | – |
| • IOI Participants 1992 – GERMANY | ||||
| Surname | Name | School | Province | Medal Position |
| Butler | David | Afrikaans Boys’ High | Gauteng | Silver |
| Coetzer | Martin | Afrikaans Boys’ High | Gauteng | – |
| De Oude | Walter | Roosevelt High | Gauteng | – |
| Guthrie | Keith | Roosevelt High | Gauteng | Silver |