SJB

SJB may refer to:
 * Hochkirchliche St.-Johannes-Bruderschaft, a German High Church Lutheran religious society
 * Sajau Basap language's ISO code
 * San Joaquín Airport's IATA code

In schools:
 * St. Jean de Brebeuf Catholic High School, Woodbridge, Ontario, Canada
 * St. Jean de Brebeuf Secondary School, Hamilton, Ontario, Canada
 * St John the Baptist School, Woking, Surrey, England, United Kingdom
 * St. John The Baptist School (Alden, New York), United States
 * St. John the Baptist Diocesan High School, West Islip, New York, United States
 * St John Bosco Arts College, Liverpool, England

Automotive:
 * Smart Junction Box, a junction box, usually with microcontroller, for addition functions

Other:
 * Samagi Jana Balawegaya, Sri Lankan political party