India gained independence from the British Empire on August 15, 1947, making it the first major Asian country to achieve independence in the post-WWII decolonization period. While Hong Kong was a British territory, it wasn't a colonized country that 'won independence' in the same sense - it was transferred to China in 1997. Myanmar (Burma) gained independence in 1948, and Ceylon (Sri Lanka) in 1948, both after India.