Ken or KEN may refer to:

• Ken (県) meaning "prefecture" in Japanese, see Prefectures of Japan
• Ken (film), 1964 Japanese film
• Kèn, musical instrument from Vietnam
• Komisja Edukacji Narodowej, Polish National Board of Education
• In the Scots Language/northern British dialects such as Geordie, "" means "know"
• Ken ( ), the fifteenth letter of the Armenian alphabet
• Ken River in India
• Ken (doll), a product by Mattel
• Ken (magazine), a large-format political magazine
• Kenmore Air

The kèn is an instrument used in traditional Vietnamese music. It has a double reed and a conical wooden body. It produces a powerful and penetrating high-pitched sound, similar to the Chinese suona, the Korean taepyeongso, and the Persian/Indian shehnai.