The Korea National Health and Nutrition Examination Survey (KNHANES) is a national surveillance system established in 1998 to assess the health and nutritional status of Koreans. Conducted annually by the Korea Centers for Disease Control and Prevention (KCDC), KNHANES includes three components: a health interview, a health examination, and a nutrition survey. Each survey year samples approximately 10,000 individuals aged 1 year and over, collecting data on socioeconomic status, health behaviors, quality of life, healthcare utilization, anthropometric measures, biochemical and clinical profiles, and dietary intakes. The survey uses a multi-stage clustered probability design to ensure national representativeness. KNHANES provides valuable data for health policy development and evaluation, supporting over 500 publications and serving as a research infrastructure. The survey has been instrumental in developing Korean standards for health and nutrition, such as Dietary Reference Intakes, and has been used in international comparison studies. KCDC offers annual workshops to promote the broader and more proficient use of KNHANES data. Despite its strengths, data users should be cautious of variations in survey methods and questionnaires over time. The data and reports are released annually and are freely available to the public through the KNHANES website.The Korea National Health and Nutrition Examination Survey (KNHANES) is a national surveillance system established in 1998 to assess the health and nutritional status of Koreans. Conducted annually by the Korea Centers for Disease Control and Prevention (KCDC), KNHANES includes three components: a health interview, a health examination, and a nutrition survey. Each survey year samples approximately 10,000 individuals aged 1 year and over, collecting data on socioeconomic status, health behaviors, quality of life, healthcare utilization, anthropometric measures, biochemical and clinical profiles, and dietary intakes. The survey uses a multi-stage clustered probability design to ensure national representativeness. KNHANES provides valuable data for health policy development and evaluation, supporting over 500 publications and serving as a research infrastructure. The survey has been instrumental in developing Korean standards for health and nutrition, such as Dietary Reference Intakes, and has been used in international comparison studies. KCDC offers annual workshops to promote the broader and more proficient use of KNHANES data. Despite its strengths, data users should be cautious of variations in survey methods and questionnaires over time. The data and reports are released annually and are freely available to the public through the KNHANES website.