Undok was the former name for Kyŏnghŭng County, a kun located in the North Hamgyong province of North Korea. The administrative area underwent a formal name change in 1977 and remained known as Undok County until 2010.
The region is situated within the northern reaches of the country. While it served as an administrative division under the name Undok for several decades, it is currently recognized by its current designation as Kyŏnghŭng County.