To carry out the Hague Apostille procedure in Hong Kong or Macao for documents issued in Hong Kong, Macao, or mainland China, please go to the following offices:

In Hong Kong: Apostille Service - Judiciary, High Court
Apostille Service Office, Room 115, Lower Ground 1st Floor, High Court Building, 38 Queensway, RAE Hong Kong.
Tel: (852) 2825 4226
https://www.judiciary.hk/en/court_services_facilities/apostille.html

In Macao: Direcção dos Serviços de Assuntos de Justiça
Rua do Campo, n.º 162, Edifício Administração Pública, 15.º - 20.º andar, RAE Macau.
Tel.: (853) 28564225
https://www.dsaj.gov.mo/index_en.aspx