“…When the domestic literature is examined, it is seen that the researches on the concept of organisational happiness conducted in recent years is limited. Although the organisational happiness variable was examined by the researchers with the following variables, it is seen that there is no research examining the relationship between the leadership styles of the school principals and the organisational happiness levels: organisational happiness perception (Bulut, 2015), differences management (Arslan, 2018), organisational silence (Moçoşoğlu & Kaya, 2018), organisational commitment (Demircan, 2019;İncekara, 2020), organisational cynicism and organisational justice (Korkut, 2019), organisational justice (Çetin, 2019), instructional leadership (Kuvvet, 2019), trust in administrators (Kotaoğlu, 2019), DNA profiles of schools (Köse, 2020), organisational trust (Gürbüz, 2020), organisational forgiveness (Bayram, 2020), managerial style (Bulut, 2020), motivating language (Ergüven, 2020), organisational justice and authentic leadership perceptions (Demir, 2020), occupational professionalism (Karnak, 2020), psychological empowerment (Özcocak & Yılmaz, 2020), readiness for organisational change (Sevim, 2021), teacher autonomy (Pazar, 2021), quality of work life (Elmas, 2021), servant leadership (Arslan, 2021) and psychological strength (Güzel, 2021). This research is important in terms of revealing the effect of the leadership styles of school principals, who are the administrators of schools, in ensuring organisational happiness in schools.…”