The City of Rijeka is a member of the following international associations:
 

• European Healthy Cities Network
  
  
• International Association Cities and Ports – IACP 
  
  
• GISIG (Geographical Information Systems International Group) 
  
  
• EUROCITIES is the network of major European cities bringing together the local governments of more than 140 large cities in over 30 European countries (The Network of Major European Cities)
  
  
• Les Rencontres - Association of European Cities and Regions for Culture
  
  
• FECC – Federation of European Carnival Cities
  
  
• Forum of Adriatic and Ionian Cities and Towns
  
  
• Energy Cities is the European Association of local authorities inventing their energy future. Founded in 1990, Energy Cities represents more than 1000 local authorities from 30 countries. The Municipality of Rijeka has been a member of Energy Cities since 2008.
  
  
• Cities For Children
  
  
  
• Covenant of mayors commited to local sustainable energy
  
• Major Cities of Europe – IT Users Group
  

• European Cities Marketing