Banknotes of the Hong Kong dollar
The issue of banknotes of the Hong Kong dollar is governed in the Special Administrative Region of Hong Kong by the Hong Kong Monetary Authority (HKMA), the governmental currency board and central bank of Hong Kong. Under licence from the HKMA, three commercial banks issue their own banknotes for general circulation in the region.
Source: Wikipedia — Banknotes of the Hong Kong dollar (CC BY-SA 4.0)