"IKI", as an acronym, can stand for:
- The Internationales Kulturinstitut in Vienna.
- A loosely organized group of early Finnish internet activists, Internet-käyttäjät ikuisesti (The Internet Users Forever).
- The chemical compound, Iodine potassium-iodide.
- The Russian Space Research Institute originally known as IKI RAN.
The term "iki" can refer to:
- Iki Island, between the island of Kyūshū and the Tsushima islands in the Tsushima Strait
- Iki Province, a former province of Japan, now part of Nagasaki Prefecture
- Iki, Nagasaki — in Iki province
- Iki (aesthetic ideal)
- iki (album), an album by Värttinä
- The revised title of The Knights Who Say "Ni!" in the film Monty Python's Quest for the Holy Grail