<h3>Objectives:</h3> Sentinel lymph node (SLN) mapping has become the preferred method for surgical staging of endometrial cancer; however, previous studies on SLN mapping have not reported detection rates specifically in terms of obesity class. Our objective was to evaluate the success of SLN detection in endometrial cancer as it relates to body mass index (BMI). <h3>Methods:</h3> Clinicopathologic data were abstracted for patients who completed surgical staging at a single institution between 2015 and 2020. All patients who completed sentinel lymph node mapping had cervical injection with ICG green and near infrared imaging via the robotic platform. Descriptive statistics were calculated, chi-square tests were used to assess the associations between categorical variables, and independent T tests were used for continuous variables. <h3>Results:</h3> A total of 337 patients completed surgical staging over the study period. Of these, 226 women completed cervical dye injection with attempted sentinel lymph node mapping. Two hundred and ten women (92.9%) women had at least a unilateral sentinel lymph node detected with 156 women (74.3%) mapping bilaterally. The majority of patients were obese, accounting for 65% of the study population with a mean BMI of 34.4 kg/m<sup>2</sup> (range 18.5 - 66.1kg/m<sup>2</sup>). Mean BMI at the time of surgery was significantly lower for patients with sentinel lymph nodes identified compared to those who did not successfully map correlating with class I versus class II obesity (34.1kg/m<sup>2</sup> vs 39.2kg/m<sup>2</sup>, p=.02). Only two normal weight or overweight patients (2.6%) did not successfully map, while 28.5% of women with super morbid obesity (BMI>50kg/m<sup>2</sup>) did not map successfully. Of the super morbidly obese patients that mapped, only 3/7 (57.1%) mapped bilaterally. Patients that did not map had significantly longer procedure time by 35 minutes (192 vs 157 minutes, p<0.001) Eighteen patients (8%) had positive lymph nodes identified. There was no difference in rates of node positivity across weight class or by mean BMI. <h3>Conclusions:</h3> Patients with failed sentinel lymph node identification had a higher mean BMI and longer procedure time, with the highest rates of failed mapping found in super morbidly obese patients. The current results may aide in the selection of surgical staging methods and the preoperative counseling for patients, particularly those with BMI >50kg/m<sup>2</sup>.