title: International Science Olympiad
text: The International Science Olympiads (ISO) are worldwide annual competitions in different areas of science. There are 15 commonly recognized International Olympiads.
  
  Official websites 
  
   Mathematics (IMO)
   Physics (IPhO)
   Chemistry (IChO)
   Informatics (IOI)
   Biology (IBO)
   Philosophy (IPO)
   Astronomy (IAO)
   Geography (iGeo)
   Linguistics (IOL)
   Junior Science (IJSO)
   Earth Science (IESO) 
   Astronomy and Astrophysics (IOAA)
   Origami (IOIO)
   History (IHO)
   Economics (IEO)
  
  References
  
  International competitions
  Science