Object: People with type 2 diabetes (T2D) are known to have poor sleep quality. However, factors associated with poor sleep quality in T2D patients are not exactly known. Our aim was to find out which diabetic complications or clinical markers are associated with poor sleep quality in T2D. Methods: In this cross-section study, sleep quality of 151 T2D patients were assessed by using the Pittsburgh Sleep Quality Index (PSQI) questionnaire. Statistic analyze was performed by Student’s t-test, Chi-squared test, and multivariate logistic analysis. Results: Fasting c-peptide, insulin, triglyceride (TG) and waist-hip ratio (WHR) were higher in the poor sleep quality group (global PSQI score > 5). However, glycemic control markers were not significantly different in both groups. The proportion of diabetic polyneuropathy (DPN) was higher in the poor sleep quality group. Other diabetic complications did not show a significant difference between both groups. In the multivariate logistic analysis, after adjustment for sex, age, usage of insulin, TG, WHR and DPN, fasting c-peptide was the only significant marker for poor sleep quality in T2D (OR = 2.207, p = 0.048). Conclusion: Fasting c-peptide, insulin, TG, WHR and proportion of DPN were higher in the poor sleep quality group. Fasting c-peptide was significant after multivariate logistic analysis. DPN was the only complication that is higer in the poor sleep quality group. Other diabetic complications showed no significant difference in both groups.