Finland has jumped from 5th place to 1st place in the new annual World Happiness Index compiled by the United Nations Sustainable Development Solutions Network.
Norway had topped the 2017 happiness index but Finland moved up four spots to knock them off the top this year.
Previously, the report ranked countries by happiness level based on factors like life expectancy, corruption, income, freedom, healthy life expectancy and social support networks, with 156 countries included in the survey.
But this year, the happiness and well being of immigrants in 117 countries was also considered by researchers.
Report authors note the close correlation between the happiest countries, and the countries with the happiest immigrants. They say this shows that the happiness of immigrants depends predominantly on the quality of life where they live now, rather than the societies where they came from.
Finland came top of the overall list, and also at the top of the happiest immigrants index.