Ji
Ji may refer to:

Names and titles
Ji (surname), the pinyin romanization of several distinct Chinese surnames
Ji (Korean name), a Korean surname and element in given names (including lists of people with the name)
-ji, an honorific used as a suffix in many languages of India
J.I the Prince of N.Y, American rapper J.I.
Ji (or Hou Ji), the legendary founder of the Zhou dynasty

Places in China
Jì (冀), pinyin abbreviation for the province of Hebei
Jí (吉), pinyin abbreviation for the province of Jilin
Ji (state), an ancient Chinese state
Ji City (disambiguation), several places
Ji County (disambiguation), several places
Ji Prefecture (Shandong), a prefecture in imperial China
Ji Province, one of the Nine Provinces of ancient China
Ji River, either of two former rivers

Organizations
Jamaat-e-Islami (disambiguation), several organizations
Jemaah Islamiyah (JI), a Southeast Asian militant Islamist rebel group
Jurong Institute (JI), a now-defunct pre-university institution in Singapore
JI, IATA code for Meraj Airlines since 2010
JI, IATA code for Midway Airlines (1993–2003)

Other uses
Ji (film), a 2005 Indian Tamil film starring Ajith and Trisha Krishnan
Ji (monk) (632–682), Chinese monk
Ji (polearm) (戟), a kind of Chinese polearm
Ji Koizumi, a character in the anime Guru Guru Pon-chan
Just intonation, an alternative, and often subordinate to the contemporary Western establishment, tuning concept employed in various musical-compositional procedures and theories
Joint Implementation (JI), one of the flexibility mechanisms of the Kyoto Protocol
There are two different kana (Japanese script) letters that are romanized as ji:
じ: Shi (し) with dakuten (voicing marks)
ぢ: Chi (ち) with dakuten
Another name for the Chinese hairpin
JI, Tsurumi Line, a line operated by the East Japan Railway Company
JI, Hitahikosan Line, a line operated by the Kyushu Railway Company

See also
Jicheng (disambiguation)