Abstract Objective To determine the feasibility and acceptability of a diabetes insulin self-management education (DIME) group intervention for people with type 2 diabetes starting insulin. Design Single-centre parallel randomised pilot trial. Setting Primary care, South London, UK. Subjects Adults with type 2 diabetes, requiring insulin treatment, on maximum tolerated dose of 2 or more oral antidiabetic drugs with HbA1c > / = 7.5% (58 mmol/mol) on 2 occasions. We excluded people who were non-fluent in English; morbid obesity (BMI > / = 35 kg/m²); in employment that contraindicates insulin treatment; and those with severe depression, anxiety disorders, psychotic disorders, personality disorders, or cognitive impairment. Methods Participants were randomised using blocks of 2 or 4 to 3, 2-h group, face-to-face, DIME sessions or standard insulin group education sessions (control). We assessed feasibility according to consent to randomisation and attendance at intervention (DIME) and standard group insulin education sessions. Acceptability of the interventions was determined using exit interviews. We additionally measured change in self-reported insulin beliefs, diabetes distress and depressive symptoms between baseline and 6-month post-randomisation. Results There were 28 potentially eligible participants, of which 17 consented to randomisation, 9 were allocated to the DIME group intervention and 8 were allocated to the standard group insulin education. Three people withdrew from the study (1 from DIME and 2 from standard insulin education) before the start of the first session and did not complete baseline questionnaires. Of the remaining participants (n = 14), all DIME participants (n = 8) completed all 3 sessions, and all standard insulin education participants (n = 6) completed at least 1 standard insulin education session. The median group size was 2, the mean age of participants was 57.57 (SD 6.45) years, and 64% were female (n = 9). Exit interviews demonstrated that all participants (n = 7) found the group sessions acceptable, and thematic analysis of interview transcripts indicated social support, the content of group sessions and post-group experiences were positive, especially amongst DIME participants. There was improvement on self-report questionnaires. Conclusions The DIME intervention was acceptable and feasible to deliver to participants with type 2 diabetes starting insulin in South London, UK. Trial registration International Study Registration Clinical Trial Network (ISRCTN registration number 13339678).