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Plasma circulating P‐selectin glycoprotein ligand‐1 (PSGL‐1) levels and its clinical correlation in patients with epithelial ovarian cancer (EOC) are unknown. The study determined plasma PSGL‐1 levels in EOC patients and investigated its relationship with clinicopathological factors and prognosis. Plasma PSGL‐1 levels were measured using ELISA in 69 patients with EOC, 34 patients with benign ovarian cystadenoma, and 36 healthy controls. Subsequently, the relationship between PSGL‐1 levels and clinicopathological characteristics of patients, as well as the prognosis of EOC patients, was examined. Additionally, the specificity and sensitivity of plasma PSGL‐1 were assessed through ROC curve analysis. Plasma PSGL‐1 was upregulated in EOC patients compared with healthy subjects and/or patients with benign ovarian cystadenoma (p < 0.01). Elevated levels of PSGL‐1 in the plasma were positively associated with advanced FIGO stage (p < 0.001), tumor size (p = 0.001), tumor metastasis (p = 0.036), and tumor recurrence (p = 0.013), while was negatively correlated with residual tumor size (p < 0.001). Kaplan–Meier survival analysis showed that high plasma PSGL‐1 levels were associated with progression‐free survival (p = 0.0345). In univariate and multivariate Cox regression analyses, PSGL‐1 (HR = 1.456, p = 0.009) was an independent prognostic marker. Plasma PSGL‐1 levels distinguished EOC patients and healthy individuals (AUC = 0.905), patients at late and early FIGO stages (AUC = 0.886), and metastatic and non‐metastatic EOC (AUC = 0.722). The expression of plasma PSGL‐1 is significantly increased in patients with EOC, serving as a reliable biomarker to differentiate between healthy individuals and those with EOC. Furthermore, PSGL‐1 in patients is correlated with prognostic indicators, such as advanced FIGO stage, tumor lymph node metastasis, and progression‐free survival. [ABSTRACT FROM AUTHOR]