Vaingankar JA, et al. – This study was designed not only to establish the validity and reliability of the Short Warwick Edinburgh Mental Well–being Scale (SWEMWBS) in service users with schizophrenia, depression and anxiety spectrum disorders in Singapore but also to estimate SWEMWBS scores across socio–demographic and the three psychiatric diagnostic groups in the sample. This research supported the validity and reliability of the SWEMWBS in individuals with schizophrenia, depression and anxiety spectrum disorders in Singapore.