Same-session concurrent training (CT) incorporating high-intensity interval training (HIIT) or continuous aerobic training (AT) alongside resistance training (RT) may be a feasible, efficient and enticing form of exercise to achieve exercise guidelines and improve physiological health and related outcomes in overweight and obesity. The aim of this systematic review and meta-analysis was to: update the current knowledge-base on the effectiveness of otherwise healthy overweight and obese individuals performing same-session concurrent HIIT/AT and RT to improve obesity-related health outcomes. Studies which completed same-session concurrent HIIT/AT and RT in overweight and obese populations were retrieved from 5 electronic databases (PubMed, CINAHL, SPORTDiscus, MedLine, and Web of Science) and systematically reviewed and, where appropriate, evidence was pooled through meta-analysis. 5 studies totalling 193 participants were included, no studies incorporating HIIT into CT programmes were identified.  The mean tool for the assessment of study quality and reporting in exercise (TESTEX) score of the five studies was 8/15. Where sufficient data was available pooled evidence revealed standardised mean differences in; body mass -1.7 kg (95% CI -3.6, 0.1; P = 0.07; n = 136), body fat percentage -3.7 % (95% CI -6.4, -1.1; P = 0.006; n = 136) and waist circumference -2.8 cm (95% CI -4.0, -1.7; P< 0.001; n = 115). CT was effective in improving cardiorespiratory fitness (average increase 2.7 ml.kg-1min-1), as well as secondary outcome measures including strength, though there was insufficient data to undertake accurate meta-analysis. CT was established as an effective means of improving measures of physiological health and related outcomes including cardiorespiratory fitness, body composition and strength compared to a non-exercise control in overweight and obese individuals. CT may also demonstrate greater improvements (particularly for body fat) than either exercise type (AT or RT) in isolation, due to an amalgamation of the physiological adaptations attained from each. However, a low sample size ensured that making assumptions from the data was difficult. Accordingly, results should be interpreted with caution. CT is a beneficial form of exercise training for overweight and obese individuals, though, further research and confirmatory studies are required, particularly CT research including the use of HIIT.