IK or Ik may refer to:
Iker Casillas Fernández (Spanish pronunciation: [ˈiker kaˈsiʎas ferˈnandeθ]; born 20 May 1981) is a Spanish professional footballer who plays for Portuguese club Porto and the Spain national team as a goalkeeper.
"Iko Iko" (/ˈaɪkoʊ ˈaɪkoʊ/) is a much-covered New Orleans song that tells of a parade collision between two tribes of Mardi Gras Indians and the traditional confrontation.
Ikebukuro Station (池袋駅, Ikebukuro-eki) is a major railway station located in the Ikebukuro district of Toshima, Tokyo, Japan, shared by East Japan Railway Company (JR East), Tokyo subway operator Tokyo Metro, and the two private railway operators Seibu Railway and Tobu Railway.
Ikat, or ikkat, is a dyeing technique used to pattern textiles that employs resist dyeing on the yarns prior to dyeing and weaving the fabric.