The Scandinavian country came out on top in the United Nations' analysis of the countries that have the most happiest people, basing their ratings on income, life expectancy, social support and generosity.
Following swiftly behind Finland was Norway, Denmark and Iceland with Switzerland, the Netherlands, Canada and New Zealand following closely behind. Sweden and Australia completed the top 10.
Professor John Helliwell said of Finland: "There is a view which suggests that historically communities that lived in harsher weather were brought together by greater mutual support. You see this with farming communities as well, who will get together to pull a barn roof up. They don't ask about who's paying what. So the colder climate of the Northern [European] countries might actually make social support easier."
The top 10 have remained the same from the previous two years but the order is slightly different from before.
They added in their report: "The main focus of this year's report, in addition to its usual ranking of the levels and changes in happiness around the world, is on migration within and between countries. The overall rankings of country happiness are based on the pooled results from Gallup World Poll surveys from 2015-2017, and show both change and stability.
"There is a new top ranking country, Finland, but the top ten positions are held by the same countries as in the last two years, although with some swapping of places. Four different countries have held top spot in the four most recent reports- Denmark, Switzerland, Norway and now Finland.
"All the top countries tend to have high values for all six of the key variables that have been found to support well-being: income, healthy life expectancy, social support, freedom, trust and generosity. Among the top countries, differences are small enough that that year-to-year changes in the rankings are to be expected."