This systematic review explores how workplace interventions aimed at improving working conditions impact employee health and wellbeing, with a particular focus on parents. It finds that a range of approaches, including flexible working, reduced hours, manager support, and employee assistance programmes, can improve outcomes such as stress, sleep, and work-life balance. However, the evidence is mixed and often limited by study quality and inconsistency. Notably, very few interventions are designed specifically for fathers. Overall, the findings suggest that improving working conditions can support wellbeing, but impact depends on how interventions are designed and implemented.