["The objective of this study was to analyse Danish general practitioners' (GPs) a priori attitudes and expectations towards a nationwide mandatory accreditation programme.", 'This study is based on a nationwide electronic survey comprising all Danish GPs (n = 3,403).', 'A total of 1,906 (56%) GPs completed the questionnaire. In all, 861 (45%) had a negative attitude towards accreditation, whereas 429 (21%) were very positive or posi-tive. The negative attitudes towards accreditation were associated with being older, male and with working in a singlehanded practice. A regional difference was observed as well. GPs with negative expectations were more likely to agree that accreditation was a tool meant for external control (odds ratio (OR) = 1.87 (95% confidence interval (CI): 1.18-2.95)), less likely to agree that accreditation was a tool for quality improvement (OR = 0.018 (95% CI: 0.013-0.025)), more likely to agree that it would affect job satisfaction negatively (OR = 21.88 (95% CI: 16.10-29.72)), and they were generally less satisfied with their present job situation (OR = 2.51 (95% CI: 1.85-3.41)).'] Do almost half of the Danish general practitioners have negative a priori attitudes towards a mandatory accreditation programme?