Diet/nutrition is the first-line non-pharmacological therapy in the treatment of diabetes. Diet/nutrition counseling is infrequently provided by primary care providers (PCPs), who have limited nutrition education in both medical and advanced practice provider curricula. This quality improvement project aimed to improve knowledge and attitude, and frequency of diet/nutrition counseling by PCPs among patients with uncontrolled diabetes (glycosylated hemoglobin A1c ≥8%), by providing an online continuing medical education (CME) program on diabetes diet/nutrition. At a community health center in New England, PCPs attended a live 50-minute online CME program that was developed internally, which taught PCPs current diet/nutrition guidelines and recommendations related to diabetes. Knowledge was assessed prior to and two weeks following the program, utilizing a 10-question tool, the Nutrition Management of Diabetes Assessment (NMDA). Similarly, attitude was evaluated using two subscales of the Nutrition in Patient Care Survey (NIPS): Nutrition in routine care and Physician efficacy. Chart audits of patients with uncontrolled diabetes were evaluated to assess PCPs documentation of diet/nutrition counseling four weeks prior to and six weeks following the CME program. In September 2023, PCPs (n = 29) completed the CME program. There was an improvement in knowledge in the NMDA amongst PCPs (36% difference, p < 0.001). Attitude scores from two subscales of the NIPS were evaluated and both showed improvement, however only physician efficacy was significant (15% difference, p < 0.01). There was a positive difference in the trend of diet/nutrition counseling after the education program (p < 0.05). An online CME program improved diabetes diet/nutrition knowledge and attitude of PCPs and improved counseling practices for patients living with uncontrolled diabetes. The education program provided PCPs current standards of care guidelines/recommendations, which they can utilize when counseling patients with diabetes. PCPs would benefit from dedicated continuing education programs regarding diet/nutrition therapy for chronic illnesses.