MJS

MJS can refer to:
 * Minneapolis Japanese School
 * Milwaukee Journal Sentinel
 * Young Socialist Movement (French: Mouvement des Jeunes Socialistes), France
 * Movement of Young Socialists, Belgium
 * Michael Joseph Savage, Prime minister of New Zealand
 * , the recommended file extension for JavaScript module files
 * mjs, the ISO 639-3 code for the Miship language
 * Mariner Jupiter-Saturn, acronym for the cancelled NASA probe