This research aimed to determine school happiness level of the teachers based on their opinions. For this purpose, 'School Happiness Scale' was developed by the researchers. The validity and reliability of the School Happiness Scale were tested. And then, the scale was applied to 484 teachers to determine their school happiness level. Research Method: In the study, a quantitative research design was employed during the data collection and the analysis phases. Results: The School Happiness Scale consists of 26 items and five sub-factors. The item-total correlations range from .54 to .86. The five factors explain 65.09% of the total variance. The results showed that teachers

gÖrkay (ankara ÜniverSiteSi-tÜrkiye), anne-Marie gUiMier-SOrBetS (aieMa-FranSa/FranCe), werner JOBSt (aUStrian aCaDeMy OF SCienCeS-avUStUrya/ aUStria), I. hakan Mert (BUrSa ULUDag ÜniverSiteSi-tÜrkiye), Maria LUz NEIRA JIMÉNEZ (UniverSiDaD CarLOS iii De MaDriD-iSPanya-SPain), aSher OvaDiah (teL aviv UniverSity-ISraiL/iSraeL), MehMet ÖnaL (harran ÜniverSiteSi-tÜrkiye), DaviD ParriSh (PUrDUe UniverSity-a.B.D./U.S.a), gÜrCan POLat (ege ÜniverSiteSi-tÜrkiye), Marie-PatriCia raynaUD (CnrS PariS-FranSa/FranCe), Derya AHIN (BUrSa ULUDag ÜniverSiteSi-tÜrkiye), MUStaFa AHIN(BUrSa ULUDagÜniverSiteSi-tÜrkiye), y. SeLçUk ener (gazi ÜniverSiteSi-tÜrkiye), eMine tOk (ege ÜniverSiteSi-tÜrkiye), PatriCia wittS (aieMa-BirLeŞik kraLLik/UniteD kingDOM), LiCinia n.C. wrenCh (new UniverSity OF LiSBOn-POrtekiz/POrtUgaL)