The South Korean standard language or Pyojuneo () is the South Korean standard version of the Korean language. It is based on the Seoul dialect, although various words are borrowed from other regional dialects. It uses the Korean alphabet, created in December 1443 CE by the Joseon-era king Sejong the Great. Unlike the North Korean standard language (), the South Korean standard language includes many Sino-Korean words (i.e., loan-words from Chinese or Japanese), as well as some from English and other European languages.
When Korea was under Japanese rule, the use of the Korean language was regulated by the Japanese government. To counter the influence of the Japanese authorities, the () began collecting dialect data from all over Korea and later created their own standard version of Korean, , with the release of their book Unification of Korean Spellings () in 1933. On January 19, 1988, the Ministry of Education issued the Regulations of the Standard Language, Ministry of Education Announcement No. 88-2 () to establish the modern standard Korean, it was later amended on March 28, 2017 via Ministry of Culture, Sports and Tourism Announcement No. 2017-13 ().