MSJ

MSJ may refer to:


 * Microsoft Systems Journal, a former technical journal by Microsoft Corporation, merged into MSDN Magazine
 * Mission San Jose High School, a high school in Fremont, California, United States
 * Motion for Summary judgment, a legal term requesting a judgment without a full trial
 * Mount Saint Joseph (disambiguation), several places and schools
 * Misawa Airport (IATA airport code ), Misawa, Aomori, Japan
 * Ma language (ISO 639 language code )
 * Master of Science in Journalism