The Caribbean Community Reparations Commission expanded the list of targeted countries Tuesday, adding Spain, Portugal, Denmark, Norway and Sweden, TheLocal.no reported.
The group had already announced litigation against Britain, France and Netherlands.
"For over 400 years Africans were classified in law as non-human, chattel, property and real estate," Hilary Beckles, the historian who leads the commission, said in a statement. "This history has inflicted massive psychological damage upon African descendants. Only a reparatory dialogue can begin the process of healing and repair."
Norway, as part of Denmark, established colonies on St. Thomas, St. John and St. Croix. By 1754, 14,000 of the islands' 16,000 inhabitants were slaves.
Richard Stein, one of the commission's lawyers, said they will take the case to the International Court of Justice if an out of court agreement cannot be reached.
Last month, Mark Simmonds, Britain's minister for the Caribbean, said he doubts the lawsuits will result in a monetary award.
"Do I think that we are in a position where we can financially offer compensation for an event two, three, 400 years ago? No, I don't," he said.