National Route 23 is a national highway in South Korea connects Gangjin County to Dongnam District, Cheonan.

It established on 31 August 1971.

[1] South Jeolla Province North Jeolla Province South Jeolla Province North Jeolla Province South Chungcheong Province Sejong City South Chungcheong Province Sejong City South Chungcheong Province IS: Intersection, IC: Interchange