1936 Berlin - participated
1956 Melbourne - sports boycott
1976 Montreal - African nations boycott
1980 Moscow - sports boycott
1984 Los Angeles - Soviet Union boycott
2014 Sochi - boycott final preparation coup in Kiev
2022 Beijing - US announces diplomatic boycott

Beijing Winter Olympics 2022

UNGA Adopts Consensus Resolution Spotlighting Unifying Power of Sport, as Delegates Note Complex Global Landscape Ahead of Beijing Winter Games

Against the backdrop of today's manifold challenges, delegates paid tribute to the ancient Greeks' use of sports competition to foster peace, adopting the 193‑member Assembly's annual draft resolution entitled, "Sport for development and peace:  Building a peaceful and better world through sport and the Olympic ideal" (document A/76/L.13). 

Members then spotlighted the role science can play in helping people and communities forge a more sustainable world, adopting a second draft resolution titled "International Year of Basic Sciences for Sustainable Development, 2022" (document A/76/L.12).

What is a diplomatic boycott?

It means, President Joe Biden won't dispatch U.S. dignitaries to attend the Games in Beijing [_link]

— CBC Sports (@cbcsports) December 6, 2021