The Gyeongbu Expressway (Korean: 경부고속도로; Asian Highway Network AH 1) is the second oldest and most heavily travelled expressway in South Korea, connecting Seoul to Suwon, Daejeon, Gumi, Daegu, Gyeongju, Ulsan and Busan.

It has the route number 1, signifying its role as South Korea's most important expressway.

Inspired by the Autobahn during a trip to Germany, South Korean President Park Chung Hee proposed the construction of the Gyeongbu Expressway as an election pledge in 1967.

As a results, this expressway became a part of Seoul Special Metropolitan Route 06.

However, the name remains the same, on Traffic Broadcasting System, it is still called Gyeongbu Expressway or the name "Sigugan", and this section is also designated as Asian Highway 1.