The Basic Law of Hong Kong stipulates that Chinese and English are the two official languages of Hong Kong. In 2016, Cantonese is the predominant language spoken by 88.9% of the population and widely used in education, broadcasting, government administration, legislation, and judiciary, as well as for daily communication. English is a major working language spoken by 4.3% of the population and widely used in commercial activities and legal matters. Putonghua is more widely used due to the increase in tourism-related commerce from the mainland, which is spoken by 1.9% of the population. The proportion of population speaking other Chinese dialects is 3.1% and other language (Filipino, Indonesian, other Asian languages and other European languages) is 1.9% (HKSAR Government, 2019a).

Hong Kong is an ethnically homogenous society, with about 92% Chinese descent which comprise the vast majority of the population. For the non-Chinese population, it consists of various ethnic groups, including 31.5% Filipino, 26.2% Indonesian, 14.5% South Asian (6.2% Indian, 4.4% Nepalese, 3.1% Pakistani, 0.8% Bangladeshi and Sri-Lankan), 11.2% Mixed, 10.0% White,  1.7% Thai, 1.7% Japanese, 1.4% other Asian, 1.1% Korean, and 0.6% Black and Latin American (HKSAR Government, 2019a).

References:

HKSAR Government. (2019a, February 2019). GovHK: Hong Kong – the Facts. Retrieved from https://www.gov.hk/en/about/abouthk/facts.htm