In the sustainable development process, it is important to ensure a balance between economic,social and environmental goals, and to distribute the wealth created fairly among income groups.Therefore, in order to increase social welfare and happiness, it is necessary to effectively combatsocial inequalities in all areas of society. In studies on the subject, the effect of incomedistribution inequalities on the level of happiness has generally been investigated. However, it isan important issue to investigate the effects of social inequalities in other areas such aseducation and health, as well as income, on the level of happiness due to life satisfaction. In thiscontext, logistic regression analysis was carried out in order to investigate the effect of existingsocial inequalities in the world's countries on the level of happiness. In the model, the happinesslevel of the world countries (happy and unhappy countries) is the dependent variable, while theindependent variables are social inequalities in education, health and income. The happinessindex data included in the 2019 world happiness report were used in grouping the countries ofthe world according to the level of happiness. The independent variables representinginequalities in the social field are the inequality (%) in education, life expectancy (health), andincome, which are the determinants of the human inequality coefficient in UNDP's 2019 humandevelopment report. In the grouping of countries as happy and unhappy, the arithmetic averageof the world happiness index data of 104 countries included in the analysis was taken intoaccount, 50 countries above the average were evaluated as "happy" and 54 countries below theaverage were evaluated as "unhappy". As a result of the logistic regression analysis; It has beendetermined that inequalities in both education and health negatively affect the level ofhappiness, and especially inequalities in the field of education have a relatively more negativeeffect on the level of happiness. In this context, within the framework of the social stateunderstanding, it is necessary to establish a system based on equality of opportunity, which thewhole society can benefit from free of charge in the fields of education and health.