Objective To assess and compare the training needs in adolescent medicine of doctors within 6 specialties as a basis for the development of pre/postgraduate and continuing medical education (CME) training curricula. Design Cross-sectional postal survey. Setting Switzerland. Participants National, representative, random sample of 1857 practising doctors in 6 disciplines (general practitioners, paediatricians, gynaecologists, internists, psychiatrists, child psychiatrists) registered with the Swiss Medical Association. Main outcome measures Perceived importance of and training interest in 35 topics related to adolescent medicine listed in a self-administered, anonymous questionnaire. Results A total of 1367 questionnaires were returned, representing a response rate of 73·9%. Clear interest in adolescent medicine was reported by 62·1% of respondents. Topics perceived to be the most important in everyday practice were functional symptoms (71·4%), acne (67·1%), obesity (64·6%), depression-anxiety (68·1%) and communication with adolescents (61·7%). Differences between disciplines were especially marked for gynaecologists, who expressed interest almost exclusively in medical topics specific to their field. In contrast, other disciplines commonly reported a keen interest in psychosocial problems. Accordingly, interest in further training was expressed mostly for functional symptoms (62·4%), eating disorders (56·3%), depression-anxiety (53·7%) and obesity (52·6%). Issues related to injury prevention, chronic disease and confidentiality were rated as low priorities. Conclusions Regardless of discipline, Swiss primary care doctors expressed a strong interest in adolescent medicine. Continuing medical education courses should include both interdisciplinary courses and discipline-specific sessions. Further training should address epidemiological and legal/ethical issues (e.g. injury prevention, confidentiality, impact of chronic conditions).