Any foreign visitor entering Hong Kong must have a valid passport for the duration of their stay, and all visitors must comply with the conditions of their visas.
General information about visas can be found on the page: https://www.immd.gov.hk/
Passport holders of several countries can visit Hong Kong without a visa for a number of days, varying from 14 days to 90 days depending on the country.
Visa-exempt countries include Japan, South Korea, Singapore, India, Philippines, Thailand, Australia, New Zealand, most European countries, Canada, and USA.
An overview of visa-exempt countries can be found on the following page: Visit Visa / Entry Permit Requirements for the Hong Kong Special Administrative Region | Immigration Department
For participants whose visa application requires an invitation letter, please send an email to the AQIS2025 email address **after completing the registration process** and including all the information required for VISA purposes (including, but possibly not limited to full name, occupation, nationality, date of birth, residential address.)