KJS may stand for:

• Karachi Japanese School, a school in Karachi, Pakistan
• Katharine Jefferts Schori, Presiding Bishop of The Episcopal Church
• The King John School,a secondary academy school in South Benfleet, Essex, England
• Kowloon Junior School, an international school in Hong Kong
• KJS (software), the KDE JavaScript engine
• "Kosovo je Srbija" ("Kosovo is Serbia"), a slogan used in Serbia as a reaction to Kosovo's declaration of independence from Serbia

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