Objective: This study aimed to identify and synthesise the factors in implementing clinical commissioning policy in improving health and/or reducing health inequalities in the English NHS. Methods: Systematic review was conducted. We searched Medline, EMBASE, CINAHL, Allied & Complementary Medicine, DH-DATA, Global Health and CINAHL for primary studies that assessed the enablers and barriers, and reported in accordance with PRISMA statement. Methodological quality was appraised using JBI Critical Appraisal tools and Mixed Methods Appraisal Tool [MMAT] to assess the methodological qualities, and synthesised performing thematic analysis. Two reviewers independently screened the papers and extracted data. Results: We included six primary studies (including a total of 1155 participants) in the final review. The studies reported two broad categories, under four separate themes: agenda of health inequalities not fully addressed; poor evidence for reducing health inequalities; reform through restructuring of organisations, and strategic approaches. Conclusion: This study provides useful factors – enablers and barriers – to implement and deliver clinical commissioning policy in improving health and wellbeing. These factors could be assessed in future to develop objective measures and interventions to establish the link between commissioning and health inequalities improving equitable access, health outcomes and effective partnerships.