Background: This review explored (1) what digital psychological wellbeing interventions for family carers of people with intellectual and developmental disabilities were reported in the literature, (2) evidence about their effectiveness, (3) factors affecting their implementation and (4) experiences of family carers who attend them. Methods: Seven databases were searched using search terms related to intellectual and developmental disabilities, carer role, wellbeing and digital delivery formats. Data from 23 studies were synthesised narratively. Results: Identified interventions were categorised in five broad groups: mind-body, relaxation, mindfulness and acceptance; psychoeducation and support groups; positive thinking and self-compassion; spiritual; and expressive writing. Only 43% of included studies met seven (100%) or six (85%) quality indicators based on the Mixed Methods Appraisal Tool. Conclusions: There is a developing literature on digital interventions for family carers of people with intellectual and developmental disabilities. Digital supports will likely become more important with continuing technological advances and increasing need.