Purpose -There is growing evidence that health behaviour change interventions are associated with mental health and wellbeing improvements. This paper aims to examine the effect of healthy lifestyle interventions on mental wellbeing. Design/methodology/approach -Six databases (Medline, Evidence Based Medicine Cochrane Registered Controlled Trials, Evidence Based Medicine Full Text Reviews, British Nursing Index, Embase, PsycINFO) were searched from database commencement up to April 2013. A broad focus on lifestyle interventions and mental health and wellbeing outcomes was chosen. Papers were systematically extracted by title then abstract according to predefined inclusion and exclusion criteria. Inclusion criteria: any individual population (non-couple/family); any health behaviour change interventions; mental health and wellbeing outcomes; and a one-two level of evidence. Interventions aimed at workers were excluded, as were articles assessing cognitive functioning rather than mental health or wellbeing, or those using medications in interventions. Findings -Two authors reviewed 95 full papers. In total, 29 papers met inclusion criteria, representing a range of interventions spanning physical activity, diet, alcohol intake, drug use and smoking. A range of measures were used. The majority (n ¼ 25) of studies demonstrated improvements on at least one indicator of mental health and wellbeing. Limitations include the broad range of outcome measures used, varied follow-up times and the lack of detail in reporting interventions. Originality/value -Health behaviour change interventions targeting physical outcomes appear to have benefits to mental health and wellbeing spanning healthy populations and those with physical or mental health problems. Evidence is strongest for interventions targeting exercise and diet, particularly in combination and the actual lifestyle changes made and adherence appear to be important. However, it is not clear from this review which specific components are necessary or essential for improvements in mental health and wellbeing.