The two people have a long list of potential contacts after going to a gym, restaurant and using public transport, local media Bergens Tidende reports.
The two people in question both tested positive for coronavirus on Saturday and the local municipality is currently working to trace all potential contacts.
The director of the Bergen Municipality’s Heath Services Authority (Etat for helsetjenester) Brita Øygard told Bergens Tidende that well over one hundred people may be required to self-isolate once tracing is complete.
“I don’t know whether we will be able to call everyone today,” Øygard is reported as saying.
Some people in the contact chain may no longer be in Bergen and may need to be tested in other municipalities, according to the report.
The story has gained some attention in national media because Norway's current low infection numbers contrast with the potential large number of people in the contact chain.
In the seven days prior to last Thursday, the most recent day for published figures at the time of writing, the Norwegian Institute of Public Health reported between 4 and 19 new cases of coronavirus each day. A total of 32 new cases were confirmed last week but no new cases were registered on Sunday according to broadcaster NRK.
The Bergen cases are two of three confirmed new coronavirus cases reported on Saturday, according to newspaper VG.