INS and Insulin resistance: <h4>Objective</h4>This study evaluated the relationship between vitamin D status and insulin resistance (IR) among Korean adolescents, focusing on the differences between normal-weight and overweight/obese groups using non-insulin-based IR indices.<h4>Methods</h4>In this cross-sectional study, data from 3,838 adolescents (age: 12-18 years) who participated in the Korea National Health and Nutrition Examination Survey (KNHANES) from 2008 to 2014 were included.