BSJ is an acronym that can stand for:
Bairnsdale Airport Ballet San Jose, formerly Ballet San Jose Silicon Valley Bibliothèque Saint-Jean Bachelor of Science, Journalism Bedford St Johns railway station Benjamin St-Juste (born 1997), Canadian player of American football Boy Scouts of Japan, a former name of the Scout Association of Japan Berkeley Scientific Journal, the undergraduate science journal of the University of California, Berkeley Baby Surprise Jacket, a knitting pattern