Abstract Background and Aim Public transport use has been linked to several health benefits in the general population, and is crucial for older adults’ mobility, due to an age-related decline in mobility, and particularly the ability to use other transport modes. The objective of this systematic review is to determine what is known about the physical and mental health outcomes of public transport use by older adults and to identify remaining gaps in the literature. Methods Five electronic databases were searched in April 2023, with an update in January 2024: Pubmed, Scopus, Web of Science, Ageline and Transport Research International Documentation (TRID). Included were studies that were in English, contained a measure of public transport use as exposure, and any health outcome, including mental or physical health, physical or cognitive function, morbidity, or mortality, among people aged ≥ 60 years. Results Of a total of 2247 unique records that were screened, the full text of 20 was assessed for eligibility and 11 were identified as eligible. Citation search identified two additional studies, amounting to a total of 13 included studies. Significant health outcomes described in assessed studies were decreased obesity and depressive symptoms, and to a lesser extent increased gait speed and cognitive function. Conclusions Initial evidence suggests a positive impact of public transport use on obesity, depressive symptoms, gait and cognitive function, although available research was limited in context and methodology. Further research should focus on determining causality between public transport use and health, and be conducted in more diverse contexts. Transport and urban planners, as well as policymakers, should consider the implications of public transport on the health and independence of older adults. Key messages • Public transport use is linked to reduced obesity and depression among older adults. Links with other health outcomes were reported in several studies, but evidence is scarce. • Current research is limited in terms of quantity, scope, and design. Future research should be conducted in wider contexts, encompass a broader range of health outcomes, and address reverse causality.