Ii or ii can refer to:
- ii (digraph), a digraph in certain romanized alphabets
- Ii, Finland, a municipality of Finland
- Ii is a Japanese surname, daimyo of Hikone
- Ii clan, Japanese clan (Sengoku period)
- Ii Naomasa, one of four Guardians of the Tokugawa clan
- Ii Naoyuki, a Japanese author
- iiNet, a major Australian Internet service provider trading as simply ii;
- 2 (number), in lowercase Roman numerals
- Illegal immigrant (especially in Hong Kong vernacular)
- Invariant chain
- ii (IRC client), short for IRC It, an Internet Relay Chat client for Unix-like operating systems
- John Papa Īī, Hawaiian noble
- Yi language (ISO 639 alpha-2, ii)
- Supertonic, in music
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