Norway has added Britain, Austria, Greece and Ireland to its list of 'red' quarantine countries.
From August 22, any arrivals from those countries, whether European tourists or returning Norwegian holidaymakers, must self-quarantine for 10 days.
Similar restrictions will also be imposed on those coming from the Danish capital Copenhagen, the Norwegian foreign ministry said in a statement.
At the time of writing, Norway has recorded 10,162 coronavirus cases and 262 related fatalities.
Norway quarantines all travellers arriving into the country from 'red' listed countries- with more than 20 confirmed new COVID-19 cases per 100,000 population, to curb the spread of the novel virus.
Some countries already on the 'red' list include Andorra, Belgium, Bulgaria, Croatia, Luxembourg, Portugal, Spain and Romania.
Norwegians have also been advised not to travel abroad “that is not strictly necessary”.
While not a member of the European Union, Norway belongs to the passport-free Schengen travel zone.
It had some of the strictest travel restrictions in Europe in the early phase of the pandemic before gradually lifting them from June.