Mungyeong Saejae (Korean: 문경새재) is a mountain pass in central South Korea.

Runoff from the Goesan side eventually flows into the Han River, which passes through Seoul to meet the Yellow Sea at Incheon.

During the Joseon period, Mungyeong Saejae played an important role as the gateway in and out of the Gyeongsang province.

Three great gates which maintained control over the pass during that time still stand, although the only people who go through them now are tourists.

Mungyeong Saejae is the subject of at least one traditional Korean folksong in the arirang style.