- Cetinje – Montenegro
Friendship Agreement signed in Rijeka on 10 september 2010
- Csepel – Hungary
Friendship Agreement signed in Rijeka on 8 February 1997 and in Csepel on 8 March 2002
- Bitola – Republic of Macedonia
Letter of Intent whereby establishing friendly co-operation between the City of Bitola and the City of Rijeka was signed in Rijeka on 17 September 2009. Agreement whereby establishing friendly co-operation between the City of Bitola with a goal to develop co-operation in the field of economy, tourism, culture, universities, the economy and culture was signed on 4 November 2011 in Bitola.
- Burgas – Bulgaria
Letter of Intent whereby establishing friendly co-operation between the City of Burgas and the City of Rijeka was signed in Rijeka on 28 October 2008
- Dalian – PR China
Agreement whereby establishing friendly co-operation between the City of Dalian and the City of Rijeka was signed in Dalian on 26 April 2006
- Este – Italy
Cooperation Agreement was signed in Rijeka on 21 Nov. 2004
- Faenza – Italy
Cooperation Agreement was signed in Rijeka on 21 Oct. 1983
- Genova – Italy
Agreement whereby establishing friendly co-operation was signed in Genoa on 13 Oct. 2004 and in Rijeka on 7 Feb. 2005
- Karlsruhe – Germany
Cooperation agreement on establishing cooperation to improve the existing and develop new projects in the field of health care and social welfare, universities, the economy and culture was signed on 15 June in Rijeka and on 16 September in Karlsruhe.
- Kawasaki – Japan, the oldest sister city of Rijeka
The 1st Cooperation Agreement was signed on 23 June 1977.
The 2nd Plan for Cooperation was signed on 5 Nov. 1980, while the 3 Plan was signed in Rijeka on 17 May 1999.
On the occasion of the 30th anniversary of friendship between Kawasaki and Rijeka (1977-2007), the 4th Memorandum on further friendly cooperation was signed on 8 May 2007
- Ljubljana – Slovenia
Letter of Intent whereby restoring friendly co-operation signed in Ljubljana on the 4 March 2000
- Neuss – Germany
Friendly contacts were established some 40 years ago, through the activities of the Sisters of the Sacred Heart. Friendship and Co-operation Agreement was signed in 1990.
- Ningbo – PR China
Memorandum of cooperation between the two cities in the area of the economy, trade and port activities was signed in Rijeka on 5 November 2010.
Cooperation Agreement was signed in Ningbo on 7 June 2011
- Novi Sad – Serbia
Letter of Intent whereby establishing friendly co-operation between the City of Rijeka and the City of Novi Sad was signed in Novi Sad on 2 February 2011
- Roma – Italy
Cooperation Agreement was signed in Rome on 18 June 2010
- Rostock – Germany
The Agreement on Friendly Cooperation was signed on the 7 October 1974 and renewed in Rijeka on 28 October 2002.
- Trieste – Italy
Letter of Intent whereby establishing friendly co-operation between the City of Trieste and the City of Rijeka was signed in Trieste on 1 September 2010. The Agreement of Friendship and Cooperation between the City of Rijeka and the City of Trieste whereby conforming their will to deepen friendly relationships was signed in Rijeka on 20 September 2011.
- Qingdao – PR China
Letter of Intent was signed in Rijeka on 7 June 1998, and the Friendship Agreement was signed in Qingdao on 11 July 1999.
Agreement on sister relationships, between Rijeka and Qingdao was signed on 22 August 2010.