Common mental disorders (CMDs) are prevalent throughout the population. Psychological therapy is often sought via primary care; however, equitable access is not commonplace. This review aims to investigate the barriers and facilitators adults experiencing CMDs perceive when accessing evidence-based psychological treatment in England. A qualitative systematic review with meta-synthesis was conducted (PROSPERO CRD42020227039). Seven electronic databases were searched for papers from 2008 to October 2022. Searches identified 30 studies from which three themes were developed with seven subthemes. Stigma and patients' perceptions and understandings of CMDs impacted their help-seeking decision-making and engagement with services. This meant that services were not used as a first resort for help-seeking. Upon reaching services, patients appeared to perceive primary care as not prioritising mental health problems, nor as being the place where they would be supported, particularly as healthcare professionals did not appear to know about CMDs and therapy was seen as difficult to access. The interaction between healthcare professional and patients was seen as pivotal to whether patients accessed support or not. The review is limited to research conducted within England. Additionally, it only explores access barriers prior to treatment experiences. Knowledge, attitudinal, systemic and relational barriers and facilitators were identified. Future research should focus on developing stigma reduction initiatives. Clinical implications include provision of standardised training across primary care HCP (healthcare professionals). •Barriers, such as stigma, are experienced by patients before engaging with services.•Primary care is not viewed as where common mental health disorders are supported.•The patient-healthcare professional relationship is pivotal to accessing support.