Background: As cancer survivors live longer and many die from other comorbidities, it becomes increasingly important to understand factors associated with self-management behaviors for common comorbidities such as diabetes (DM). Provider guidance and inclusive communication have been found to promote self- management behaviors (SMB) in patients with DM. This study aims to explore the impact of provider communication on DM SMB in cancer survivors with DM. Methods: Patients with pre-existing DM who were newly diagnosed with early-stage breast, prostate, colorectal or lung cancer were enrolled. The Summary of Diabetes Self-Care Activities instrument was used to assess patients’ SMBs. The Patient Reaction Assessment scale was used to assess physician communication. Additional survey questions elicited the range of DM self-care recommendations made by patients’ healthcare providers. Mann-Whitney U test was used to assess the association between provider recommendations and communication and SMBs. Results: Of the 74 patients enrolled, the average age was 62 years and 64% were female. Patients who reported their healthcare providers recommended exercise reported more days of specific physical activity (median 5 vs. 0, p = 0.029). Patients who reported that their providers recommended checking their sugar checked their blood sugar more days out of the last 7 days (median 4 vs. 0, p < 0.001). Patients who reported that is hard to talk to their provider about how their treatment is going reported eating more sweets per week (median 2 vs. 1, p = 0.015) and fewer vegetables (median 0 vs. 1, p = 0.043). Conversely, patients who felt that their providers were interested in them as a person reported following a healthful eating plan for more days in a week (median 5.5 vs. 2, p = 0.016) and checked their feet more often (median 6.5 vs. 0, p = 0.008). Conclusions: Cancer survivors with DM whose healthcare providers recommend specific DM SMBs and who report better provider relationships perform DM SMBs more often. Healthcare providers should recognize that supportive recommendations for diet and exercise may improve survivors’ self-management of comorbidities.