Objective: To evaluate the impact of chronic endometritis (CE) on the recurrence of endometrial polyps (EPs) in premenopausal women who underwent hysteroscopic polypectomy.Methods: We conducted a retrospective observational cohort study in a university-affiliated hospital. Premenopausal women who underwent hysteroscopic polypectomy were enrolled, and those with definite confounding factors for polyp recurrence, including endometriosis and previous polypectomy history were excluded. A total of 233 women were enrolled in this study, including 64 cases (27.5%) with CE and 169 cases (72.5%) without CE. Comparison of the recurrence rate of EPs was performed in women with or without CE at each monitoring stage (i.e., at 3, 6, 9 and 12 months) after hysteroscopic polypectomy. Result(s): The EPs recurrence rates at one year in patients with and without CE were 26.6% (95% confidence interval [CI] 15.8%–37.4%) and 9.5% (95% CI 5.0%–14.0%), respectively, with an overall cure rate of 14.2% (95% CI 9.7%–18.7%). The hazard ratio (HR) for EPs recurrence in the EPs with CE cohort versus the EPs without CE cohort was 3.08 (95% CI 1.56-6.09) (P=0.001). Similarly, the EPs recurrence rate was significantly higher in women with CE than in those without CE at each monitoring stage (i.e., 3, 6, and 9 months). CE and multiple EPs were risk factors for polyp recurrence. The HR for EPs recurrence in the EPs with CE cohort compared with the EPs without CE cohort was 3.06, after adjustment for the number of polyps.Conclusion(s): CE was a harmful factor for the recurrence of EPs in premenopausal women after hysteroscopic polypectomy. Thus, routine screening for CE are needed, and unlike unchangeable factors, CE can be changed by antibiotics treatment. Frequent monitoring was needed for multiple EPs as the number of EPs also contributed to polyp recurrence.