Do I need a visa to visit Hong Kong ?

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In general, there are 170 countries are visa free to Hong Kong

If you have a U.S. passport, you can enter Hong Kong without a visa for up to 90 days for tourism or business.

You may visit the link below to find out if your country need a visa to Hong Kong

Source from HK immigration department

Visit Visa / Entry Permit Requirements for the Hong Kong Special Administrative Region | Immigration Department