AIMS: To compare glycemic outcomes in adults with type 2 diabetes mellitus (T2DM) before and 90聽days after initiating Omnipod庐 or Omnipod DASH庐 Insulin Management Systems. METHODS: In this retrospective observational study (N聽=聽3,592) change in HbA1c level, total daily dose (TDD) of insulin (n聽=聽3,053), and frequency of self-reported hypoglycemic events (HE, <70聽mg/dL, n聽=聽2,922) were assessed overall and by prior treatment modality (multiple daily injections (MDI) or continuous subcutaneous insulin infusion (CSII)), age group, and baseline HbA1c category. RESULTS: Change (mean聽卤聽SD) in HbA1c was -1.3聽卤聽1.7% [-14聽卤聽19聽mmol/mol] overall, -1.4聽卤聽1.7% [-15聽卤聽19聽mmol/mol] for prior MDI users, and -0.9聽卤聽1.5% [-10聽卤聽16聽mmol/mol] for prior CSII users (p<0.0001). The percentage of patients with HbA1c聽鈮�9% [鈮�75聽mmol/mol] decreased (49% to 19%), and with HbA1c聽<7% [<53聽mmol/mol] increased (10% to 22%) (p<0.0001). Prior therapy, age, and baseline HbA1c category were factors affecting change in HbA1c (p<0.05). Reductions in TDD (overall, -33聽卤聽52U, p<0.0001) and HE per week (overall, -0.5聽卤聽2.0, p<0.0001), were seen regardless of prior treatment, age, or baseline HbA1c. CONCLUSIONS: Omnipod System use was associated with statistically and clinically meaningful reductions in HbA1c, TDD, and HE compared to prior treatments in T2DM.