Over the recent decades, the topic of spirituality and health has attracted increasing research interest. Teaching has been recognized as a multi-faceted demanding profession. Particularly, spiritual well-being plays a vital role in cultivating quality of life; yet there is limited research investigating the impacts of spiritual well-being on teachers' quality of life. This study aimed to investigate the relationship between teachers' spiritual well-being and subjective quality of life in the Hong Kong context. Based on previous research, there is no universal standard to determine an "average" degree of spiritual well-being. Therefore, individual spiritual well-being can be better reflected through both the "ideals" and the "lived experience." In this cross-sectional study, the sample consisted of 671 teachers from 22 primary and secondary schools in Hong Kong. Participants were asked about their ideals of spiritual well-being as measured by Life Orientation Measure and their lived experiences of spiritual well-being as measured by Spiritual Health Measure. The results of structural equation modeling suggested a difference between Life Orientation and Spiritual Health in the pattern of predicting psychological and social aspects of quality of life. This study further explored the associations between spiritual well-being and subjective quality of life by investigating the effects of discrepancies between Life Orientation and Spiritual Health in three domains, namely personal and communal, environmental, and transcendental. The results of the path analysis suggested that the discrepancies in the three domains significantly predicted the psychological and the social aspects of quality of life among teachers.