Hong Kong citizens - Ordinary and official “Hong Kong Special Administrative Region of the PRC ( SAR ) Passport” holders are exempted from visa for their travels up to 90 days. Hong Kong citizens who have “British National Overseas Passport” are subject to visa and they can obtain three month-multiple entry visas at the Turkish border gates. Holders of “Certificate of Identity-Hong Kong ( C.I. )” and “Document of Identity for Visa Purposes-Hong Kong( D.I. )” must get their visas from the Turkish representations abroad.
Turkey has an online Turkish Visa Application System where you can apply for e-Visa online and pay your fees in a few minutes. Hong Kong citizens who meets the required criteria can obtain a visa on arrival or online at Turkish Visa Application System - https://www.evisa.gov.tr/en/apply/.