Denmark was ranked first, while African countries Togo and Benin came in last and second last respectively.
Scandinavian and Nordic countries dominated the top spots, with Finland taking second, Norway third, and Sweden seventh, while the US took 11th and the UK 18th.
And while European countries were highly represented in the top ten, being European is no guarantee of happiness, as Bulgaria's position as 146th most happy, or fifth most unhappy, testifies to.
The results were based on interviews with 1,000 people over the age of 15 in each of the 155 countries surveyed.
The countries were then ranked on a scale of one to ten, ten being happiest. Danes received an average score of just under eight while the Togolese had a score a little over three.
According to the World Happiness Report, high levels of trust can be attributed the high reported levels of happiness that was distributed equally across income levels.