Union of the Baltic Cities (UBC)
Rostock co-founded this network of cities in the Baltic Sea Region in 1991 in Gdansk (Poland). Today UBC has about 100 member cities The cities work together in different thematic commissions and working groups.
International Association of Peace Messenger Cities (IAPMC)
The International Association of Peace Messenger Cities was established in 1986 with the support of the United Nations to recognize and encourage the role and responsibility cities have in creating a culture of peace.
The network „Memory Cities“ is an unofficial association founded on the initiative of Rostock’s twin city Dunkirk in 2016. The Network gathers cities which were largely destroyed during the 1st or the 2nd World War.