The aim of this scientific research article is to describe the structure of the Latgale inhabitants’ feeling of happiness, the influencing socio-demographic factors, as well as the presentation of socio-demographic portraits of the happy and unhappy Latgale inhabitants. A key concept of „happiness” is used in this publication. The theoretical interpretation of the happiness phenomenon is based on the findings of positive psychology, according to which happiness is defined as a life satisfaction and positive evaluation of his life and positive emotions over negative emotions. As the research base Latgale region has been chosen because this is the region of Latvia with the lowest socio-economic development, which is considered one of the poor...