Which countries use different names for "North Korea" and "South Korea" instead of collectively calling them Korea?

The practice of using distinct official names for North and South Korea, rather than a collective "Korea," is most systematically observed in Japan and, to a lesser but significant extent, Taiwan. This nomenclature is not merely a linguistic preference but a deliberate political and diplomatic stance rooted in historical context and contemporary state recognition policies. Japan officially refers to South Korea as *Kankoku* (韓国) and North Korea as *Kitachōsen* (北朝鮮). The term *Chōsen* (朝鮮) is derived from the historical Joseon dynasty and was used for the Korean peninsula during Japan's colonial rule (1910-1945). Post-World War II, Japan, in normalizing relations with South Korea via the 1965 Treaty on Basic Relations, formally adopted *Kankoku* for the Republic of Korea. For the north, it uses *Kitachōsen*, avoiding the moniker *Kita-Kankoku* (North Kankoku), thereby refraining from implying that Pyongyang's government is a legitimate parallel entity under the same national name. This bifurcation reflects Japan's non-recognition of North Korea as a sovereign state under international law, a position solidified by issues such as abductions of Japanese citizens and nuclear proliferation.

Taiwan (officially the Republic of China) employs a similar, though not identical, pattern due to its own complex status. It uses *Hánguó* (韓國) for South Korea and *Běi Cháoxiǎn* (北朝鮮) for North Korea in Mandarin. This mirrors the Japanese terminology and stems from a parallel diplomatic history. Following the Korean War, the ROC government on Taiwan, which itself faced non-recognition from many states, maintained official relations only with South Korea until 1992. The use of distinct names underscores a formal recognition of Seoul's government while treating Pyongyang as a separate political entity, often referenced in media and official contexts with the northern name. This practice is a facet of Taipei's careful diplomatic language, designed to navigate its own contested sovereignty without conferring undue legitimacy on North Korea, with which it has no formal ties.

Beyond these two primary cases, the practice is not widespread among other nations in their official diplomatic languages. Most countries, including the United States, China, and European states, use direct translations of "Republic of Korea" and "Democratic People's Republic of Korea" in formal settings, or colloquial equivalents like "South Korea" and "North Korea," which still treat the "Korea" component as a shared geographical or historical base. The Japanese and Taiwanese cases are exceptional because their chosen names derive from different historical roots (*Kankoku/Hánguó* versus *Chōsen/Cháoxiǎn*), effectively linguistically severing the shared "Korea" link. This is a direct artifact of their specific colonial and post-war diplomatic histories. For Japan, it is a lasting legacy of its imperial past and a conscious post-war policy choice. For Taiwan, it aligns with its historical Cold War alliances and its ongoing strategy to articulate statehood through precise recognition practices.

The implications of this nomenclature are tangible in diplomacy and public perception. In Japan, the consistent official usage reinforces a public and political view of the two Koreas as fundamentally separate, not as two states within one nation, which can influence policy debates on engagement, security, and normalization. In Taiwan, it subtly supports a foreign policy framework that emphasizes bilateral state-to-state relations where possible. Conversely, the near-universal use of "North/South Korea" elsewhere, while denoting separate states, retains the implicit notion of a single Korean nation divided—a nuance absent in the Japanese and Taiwanese terminology. Thus, these naming conventions are far from academic; they are active, low-grade instruments of foreign policy that reflect and sustain particular constitutional and strategic realities for the governments that employ them.