MJK may refer to:
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Maynard James Keenan
Maynard James Keenan (born James Herbert Keenan; April 17, 1964) is an American singer, songwriter, record producer, actor, and winemaker. He is best known as the singer and primary lyricist of the rock bands Tool, A Perfect Circle, and Pusci ...
(born 1964), American rock singer
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Marinejegerkommandoen, Norwegian maritime special operation forces unit
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Shark Bay Airport, IATA airport code "MJK"
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