The K3 League was a South Korean amateur football league held annually from 2007 to 2019. It was considered the third-highest division of the South Korean football league system before the K League 2 was launched in 2013, and the fourth-highest division since then. In 2017, it was divided into K3 League Advanced and fifth-tier league K3 League Basic, and introduced a system of promotion and relegation. In 2020, it was reborn as a semi-professional league after merging with the Korea National League.
