Ji

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JI or Ji or ji may refer to:
* Ji (surname) (), a Chinese surname used by kings in the Zhou Dynasty
* Jemaah Islamiyah, the militant Islamic organization
* Ji (halberd) (), a kind of Chinese halberd
* Ji (film), a Tamil film starring Ajith and Trisha Krishnan
* Ji (hangul: 지; hanja: ), an ancient Korean bamboo flute
* Joint Implementation, one of the flexible mechanisms of the Kyoto Protocol
* Jurong Institute, a now-defunct pre-university institution in Singapore
* Midway Airlines (JI) IATA code
* Ji (薊) was the name of the Capital of the Chinese Yan state, one of the powers of the Warring States Period during the Zhou Dynasty, near current Beijing
* Ji County, counties in China

It may also refer to:
* Jì (), abbreviation for the Hebei province of the Peoples Republic of China
* Jí (), abbreviation for the Jilin province of the Peoples Republic of China.
* Ji (), Japanese for Chinese courtesy names
* -ji A suffix or postposition used with name or title to show respect in the Indian subcontinent