Expressways (Korean: 고속도로; Hanja: 高速道路; RR: Gosokdoro) in South Korea, officially known as National Expressways (Korean: 고속국도; Hanja: 高速國道; RR: Gosokgukdo), are controlled-access highways that form the highest level of the country's road network.

Most sections are tolled and maintained by the Korea Expressway Corporation, though a few routes are built and managed by approved private companies.

These privately operated routes are managed for a limited time before transitioning to public control.

Hi-pass is the name of an electronic toll collection system for the expressways in South Korea.

[9][10][11][12] These roads are marked by a circular blue sign with a white silhouette of a car.