Physics Olympiad
Past Problems
List of Physics Contests
JPhO (in Japanese)
Moscow City Physics Olympiad (In Russian)
MIPT (Fiztekh) Physics Olympiad (In Russian)
Saint Petersburg Physics Olympiad (In Russian)
Belarusian Physics Olympiad (In Russian)
EstPhO (in Estonian)
Eötvös Competition (in Hungarian)
Other Websites
Hong Kong Physics Olympiad Lecture Notes (2016): http://hkpho.phys.ust.hk/Protected/pastnotes_2016.html
HKBU Phrase 1 Lecture (2016-2017): http://hkpho.phys.ust.hk/Protected/HKBUnotes_2016.html
Chinese Physical Society: http://www.cps-net.org.cn/
Physical Society of Hong Kong: https://www.pshk.org.hk/
Sing Yin Physics Olympiad Solution: https://www.youtube.com/watch?v=_4A5NIyy1y4&list=PLHf8BF_xelpArBTNY1xev0LTXz6C35YuZ