This umbrella review brings together findings from 14 existing reviews on digital mental health interventions used in workplace settings. It finds that approaches such as cognitive behavioural therapy (CBT), mindfulness, and stress management programmes can lead to small to moderate improvements in stress, anxiety, depression, and burnout. However, the overall quality of evidence is low, and results vary widely. Outcomes are influenced by factors such as personalisation, level of support, and how interventions are implemented. Overall, digital tools show potential, but stronger and more consistent evidence is needed.