Hong Kong visa requirements
The rule for your own passport, from Hong Kong's official immigration page, with the date it was last checked. The same answer for every guide in Hong Kong: Hong Kong.
No visa neededup to 180 days
United Kingdom
No visa neededup to 90 days
Austria, Belgium, Bulgaria, Croatia, Cyprus, Czechia, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Iceland, Liechtenstein, Norway, Switzerland, United States, Canada, Australia, New Zealand, Japan, South Korea, Singapore, Israel, Brazil, Argentina, Chile, Mexico, South Africa
Hong Kong is a separate immigration jurisdiction from mainland China — a Chinese visa does not cover it, and going to the mainland and back needs a multiple-entry Chinese visa.
Visa required in advance
Every other passport
Entry rules change often and depend on your passport, your route and the purpose of the trip. Confirm on the official page before booking.