In this study we aim to explore whether daily hassles and uplifts at work and work engagement can be considered as daily antecedents of well-being. We also intend to test if work engagement plays a mediating role in the relationship between daily hassles and uplifts and well-being on the daily level. To achieve this, we conducted two diary studies. Instudy 1, we explored this relationship on a sample of one hundred and eighty one part-time workers who answered a daily questionnaire for (at least) four days (N =181 × 4 = 724). The results of hierarchical linear modelling demonstrated that work engagement fully mediated the effects of daily uplifts on well-being and partially mediated the effects of daily hassles on well-being. In study 2, we extended the hypothesis to a sample of full-time employees. Fifty-one workers filled in a questionnaire at the end of each working day for ten consecutive days (N = 51 ×10 = 510). The results revealed that daily uplifts were positively associated with well-being. The effects of daily uplifts and hassles on well-being were fully mediated by work engagement. The relationships explored provide new theoretical elements for models that explain which variables influence employees’ well-being. The implications for employee health and organizational success are discussed.

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daily events at work,daily hassles and uplifts,well-being,work engagement