Korea Environment Institute in South Korea

Kei (Dirty Pair Flash), a character in Dirty Pair Flash

Kei (Dirty Pair), a character in Dirty Pair

Sir Kay (sometimes spelled "Kei"), a character in Arthurian legend

Kei car, a small Japanese car

Kinetic Energy Interceptor, a project under development by the United States to defend against a ballistic missile attack

Kei (Japanese), a Japanese word or given name

Key Experience Indicator, a management term referring to a measurement of the end user's experience of a product, service or application

The Great Kei River in South Africa

Kai Islands (Kei Islands), islands in the south-eastern part of the Maluku Islands, Indonesia

Kei (Akira), a character in the Akira film and manga

Kei, gaming character and protagonist in Ape Escape 3

Kei, a country featured in the anime series The Twelve Kingdoms