Apply or check if you need a Visa to visit Hong Kong at the below link. Point 12 of Part II contains a complete list of countries and requirements.
Hong Kong Special Administrative Region | Immigration Department
Visit Visa / Entry Permit Requirements for the Hong Kong Special Administrative Region
Indian Nationals: Pre-Arrival Registration - free of charge
Delegates from India must apply for the Pre-Arrival Registration (PAR) by completing the online questionnaire.
Upon successful registration, you MUST PRINT the computer-generated notification slip on an A4 size sheet and present this at your Airline check-in counter. Your details on the printout must match those on your Indian passport. Without this notification, passengers will not be accepted for travel. For additional guidance and FAQs, click here to view a video from the Hong Kong Immigration Department.
Click here for Pre-arrival Registration for Indian Nationals