Adolescents face issues regarding physical health, mental health, sexual health, drug and alcohol problems, stress, and peer pressure. Little is known about adolescents' help-seeking behaviours in relation to health concerns. The general practitioner (GP) is usually the first point of contact for adolescents. The aim of this systematic review was to identify, describe, and summarize evidence on barriers and enablers experienced by adolescents when accessing GP-led primary care services. Systematic searches using four electronic databases (PsycINFO, MEDLINE, CINAHL, and SocINDEX) were conducted and the quality of the included studies was appraised. Six studies were included in this review. Findings indicate that barriers to GP access relate to trust, confidentiality, privacy, and communication. Adolescents also reported barriers such as transport, cost, and lack of information. Adolescents reported enablers being services that are sensitive to their needs, healthcare professionals who understand them, and services that are flexible regarding out of hours access. Listening to and acting on the voice of adolescents is important to developing youth-friendly services.