The aim of this present research is to specify the interrelation between the happiness and self-efficacy levels of the school administrators. This study is a descriptive survey model, and its population consists of the school principals and deputy principals in Amasya Province which are the subsidiaries of the Ministry of National Education. The Correlation coefficient was calculated and the methods of One-Way ANOVA, t-test, and Kruskal-Wallis "H" tests were used for the sub-problems. Once the findings of the research were analysed, a positive and mid-level significant interrelation was discovered between the happiness and the self-efficacy levels of the administrators about school administration. The results of the analysis suggest that happiness and self-efficacy levels of the school administrators according to their perceptions can be observed as "fine." Furthermore, their perceptions about happiness and self-efficacy levels differ according to the length of service groups they belong to. This is evident from the finding that the group of 1-5 years of service has highest score of happiness level, and the experience groups of 6-10, 16-20, 21 and above, and 11-15 years follow them respectively. The highest score of self-efficacy level, at the same time, is owned by the ones who have 21 years of service and above, and the experience groups of 16-20, 6-10, 11-15, and 1-5 years follow them respectively. The self-efficacy levels also show significant difference regarding the variable of age.