Look up zi in Wiktionary, the free dictionary.

Zi or ZI may refer to:

• Zi (surname) (子), a surname used by Shang kings
• Zi (title) (子), a Chinese honorific used for ancient viscounts and for master philosophers
• Zi (name) (字), an alternate term for East Asian courtesy names
• Zi (cuneiform), a sign in cuneiform writing
• Zi Corporation, a Canadian software company
• Zi (album), a 2016 album by Negură Bunget
• Zi (prefix symbol) of the binary unit prefix zebi for digital data
• Zi (Zoids), a fictional planet in the Zoids media franchise
• Zona incerta, a region in the subthalamus
• Aigle Azur (IATA airline code)
• Thracian form of Sky Father Dyēus.