Chi may refer to:

• Chi (letter) (Χ or χ), the twenty-second letter of the Greek alphabet

• Chi (length) (尺), a traditional unit of length, about ⅓ meter
• Chi (mythology) (螭), a dragon
• Chi (surname) (池, pinyin: chí)
• Ch'i or qi (氣), "energy force"
• Chinese language (ISO 639-2 code "chi")
• Ji (surname), various surnames written Chi in Wade–Giles

• Chi (2013 film), a Canadian documentary film
• Chi (2019 film), a Burmese drama film
• Chi: On the Movements of the Earth, a manga series by Uoto
• The Chi, an American drama television series
• Chi (Chobits), a character in the manga series Chobits
• Sailor Chi, a character in the manga series Sailor Moon
• Chi, a character in the manga series Chi's Sweet Home
• "Chi", a song by Korn from the 1996 album Life Is Peachy

• Chi, the hyperbolic cosine integral
• A symbol for electronegativity

• Chi Cheng (musician) (1970–2013), American musician
• Chi McBride (born 1961), American actor
• Chi Onwurah (born 1965), British politician

• Chi (kana), (hiragana ち, katakana チ)
• Chi, a person's guardian spirit in the Odinani beliefs of the Igbo people of Nigeria
• Chi River, Thailand
• an abbreviation for Chichester, England
• Chi (magazine), an Italian magazine
• Chi (instrument) a Chinese flute
• Chingford railway station, railway station code

• Chi-Chi (disambiguation)
• Chi distribution, in statistics
• Chi site, a DNA sequence that serves as a recombination hot spot
• CHI (disambiguation), as an initialism or acronym
• Chicago, known as Chi-Town
• Qi (disambiguation)