No, Hong Kong is not a separate country. It's a Special Administrative Region (SAR) of the People's Republic of China — a status that grants it remarkable autonomy while remaining constitutionally part of China.
Since the 1997 handover from British rule, Hong Kong has operated under the Basic Law, its mini-constitution, which guarantees "a high degree of autonomy" for 50 years (until 2047). This framework preserves:
Beijing manages foreign affairs and defense. The Central People's Government appoints the Chief Executive (selected by a pro-Beijing election committee) and can interpret the Basic Law. The 2020 National Security Law significantly expanded mainland authority over security matters.
Hong Kong joins some international organizations separately (WTO, APEC, IOC as "Hong Kong, China") but has no diplomatic recognition as a sovereign state. Its passport holders enjoy visa-free access to 170+ countries — more than mainland Chinese passports.
In practice, Hong Kong functions like a city-state with its own economic, legal, and social systems — but sovereignty rests unequivocally with China.