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Korean romanization is a system for representing the Korean language using the Roman alphabet. In Korea, the Korean language is written using Hangul, and sometimes Hanja.

Many romanization schemes are in common use:

• McCune-Reischauer (MR; 1937?), the first transcription to gain some acceptance. A slightly modified version of MR was the official system for Korean in South Korea from 1984 to 2000, and yet a different modification is still the official system in North Korea. MR uses breves, apostrophes and diereses, the latter two indicating orthographic syllable boundaries in cases that would otherwise be ambiguous.

  Several variants of MR, often also called "McCune's and Reischauer's", differ from the original mostly in whether word endings are separated from the stem by a space, by a hyphen or not at all; and if a hyphen or space is used, whether sound change is reflected in a stem's last and an ending's first consonant letter (e.g. pur-i vs. pul-i). Although mostly irrelevant when transcribing uninflected words, these variants are so widespread that any mention of "McCune-Reischauer romanization" may not necessarily refer to the original system as published in the 1930s. MR-based romanizations have been common in popular literature until 2000.

• The ALA-LC / U.S. Library of Congress system is based on but deviates from MR. Unlike in MR, it addresses word division in seven pages of detail. Syllables of given names are always separated with a hyphen, which is expressly never done by MR. Sound changes are ignored more often than in MR. ALA-LC also distinguishes between ‘ and ’. ^[1]
• Yale (1942): This system has become the established standard romanization for Korean among linguists. Vowel length in old or dialectal pronunciation is indicated by a macron. In cases that would otherwise be ambiguous, orthographic syllable boundaries are indicated with a period. Indicates disappearance of consonants.
• Revised Romanization of Korean (RR, also called South Korean or Ministry of Culture (MC) 2000): Includes rules both for transcription and for transliteration. South Korea now officially uses this system which was approved in 2000. Road signs and textbooks were required to follow these rules as soon as possible, at a cost estimated by the government to be at least US$20 million.^{[citation needed]} All road signs, names of railway and subway stations on line maps and signs etc. have been changed. Romanization of surnames and existing companies' names has been left untouched; the government encourages using the new system for given names and new companies.

  RR is similar to MR, but uses neither diacritics nor apostrophes, which has helped it to gain widespread acceptance on the Internet. In cases of ambiguity, orthographic syllable boundaries may be indicated with a hyphen, although state institutions never seem to make use of this option, e.g. on street signs or linemaps.^{[citation needed]}

• ISO/TR 11941 (1996): This actually is two different standards under one name: one for North Korea (DPRK) and the other for South Korea (ROK). The initial submission to the ISO was based heavily on Yale and was a joint effort between both states, but they could not agree on the final draft. A superficial comparison between the two is available here: [1]
• Lukoff romanization, developed 1945–47 for his Spoken Korean coursebooks^[2]
• Chosŏn Kwahagwŏn (조선민주주의인민공화국 과학원) romanization

McCune-Reischauer-based transcriptions and the Revised Romanization differ from each other mainly in the choice of how to represent certain Hangul letters. Both attempt to match a word's spelling to how it would be written if it were an English word, so that an English speaker would come as close as possible to its Korean pronunciation by pronouncing it naturally. Hence, the same Hangul letter may be represented by different Roman letters, depending on its pronunciation in context. The Yale system, on the other hand, represents each Korean letter by always the same latin letter(s) context-independently, thus not indicating the Hangul letters' context-specific pronunciation.

Even in texts that claim to follow one of the above, aberrations are a common occurrence and a major obstacle, e.g. when conducting an automated search on the Internet, as the searcher must check all possible spelling variants, a considerable list even without such aberrations.

In addition to these systems, many people spell names or other words in an ad hoc manner, producing more variations (e.g. 이/리 (李), which is variously romanized as Lee, Yi, I, or Rhee). For more details, see Wikipedia:Naming conventions (Korean).

SKATS is a transliteration system that does not attempt to use letters of a similar function in Western languages. A similar approach is to transliterate by hitting the keys that would produce a Korean word on a keyboard with 2[du]-beolsik layout. This can often be seen on the internet, for example in usernames.

1. ^ ALA-LC Romanization Tables.
2. ^ Korean Romanization Reference.

• Cyrillization of Korean
• List of Korea-related topics

• Comparison tables of the different systems:
  • Comparison table of ISO TR/11941, North Korean national system (1992), Revised Romanization, McCune-Reischauer, Yale (PDF file from UN Group of Experts on Geographical Names Working Group on Romanization Systems)
  • Comparison table of IPA, Yale, McCune-Reischauer, Lukoff, South Korea Ministry of Education, Joseon Gwahagwon, Revised Romanization (PDF file from Glossika Inc.)