An umbrella review of relevant systematic reviews was conducted across multiple peer-reviewed literature databases, identifying 6902 records, of which 317 full texts were screened. From the full text screening, 26 reviews presented quantitative estimates of both changes in greenhouse gas emissions and health outcomes. 200 mitigation actions were identified across all sectors, of which 178 (89%) presented modelled estimates of the effects of climate mitigation actions on greenhouse gas emissions and health across different sectors and scales. We converted mitigation actions to CO2 equivalents (CO2eq) to allow the inclusion of other greenhouse gases alongside CO2. We quantified health outcomes in terms of health co-impact intensity (an increase or decrease in years of life lost [YLL] per 100000 population per year) and climate benefits as carbon mitigation intensity (kilotonnes of CO2eq per 100000 population per year).