목적: To investigate any correlation between bone mineral density (BMD) and age at menarche in Korean females using data from the fourth and fifth Korea National Health and Nutrition Examination Survey (KNHANES IV-V; 2008-2011). 방법: In total, 37,753 individuals participated in health examination surveys between 2008 and 2011. After excluding males (n = 23,301), those without BMD data (n = 2,654), those aged ≥ 50 or <20 (n = 6162), and those who underwent early menopause (at age < 50; n = 384), 5,032 females were eligible. Age, body mass index (BMI), height, weight, and age at menarche were assessed. 결과: Simple regression analyses indicated that age (per year), exercise (per 1 day/week), BMI (per 1 kg/m2), familial osteoporosis history (yes), parity (n = 1), and menarche age (per 1 year) were associated with BMD of the entire femur, femur neck, and lumbar spine. There was a negative correlation between age at menarche and BMD of the entire femur and the lumbar. In multiple regression analyses, after adjusting for age, parity, BMI, alcohol, smoking, exercise, and familial osteoporosis history, menarche age (per 1 year) was associated with a low BMD of the entire femur and lumbar spine (p=0.028 and <0.001, respectively). 결론: Age at menarche was associated with BMD in premenopausal Korean females, aged 20-50 years. As females who experience late menarche may be prone to develop less dense bones, remedies to preserve BMD and prevent bone loss should be initiated as early as possible.