Introduction: Although surgical resection is considered as the treatment of choice for intrahepatic cholangiocarcinoma (IHCC), the role of lymph node dissection during hepatectomy is still under debate. The aim of this study was to evaluate the effect of lymph node dissection (LND) according to the size of the tumor. Method: The medical records of patients who underwent hepatectomy for IHCC between Aug 2004 to Dec 2020 were retrospectively reviewed. Excluding patients who underwent R1/R2 resection, 119 patients were enrolled in this study. Based on the maximal tumor size, patients were divided into two groups: small tumor group < 5cm (Group S, n=83) and large tumor group ≥ 5cm (Group L, n=36). The association of LND and survival rates was investigated in each group. Results: Eighty patients (67.2%) were male, and the others were female. Laparoscopic hepatectomy was done in 38 patients (31.9%). Although LND did not improve patient and disease-free survivals in Group L (p=0.356 and 0.217, respectively), it tended to improve disease-free survivals in Group S, which was statistically insignificant (5-year disease-free survival rates: 41.0% with LND, 27.8% without LND, p=0.091). Moreover, its effect was more definite in laparoscopic subgroup of Group S (5-year disease-free survival rates: 61.2% with LND, 20.3% without LND, p=0.049). However, the difference of patient survival rate did not achieve statistical significancy even in laparoscopic subgroup (p=0.199). Conclusions: LND might not be helpful on surgery for large IHCC. However, it should be positively considered in surgery for small IHCC < 5cm to decrease tumor recurrence.