Mohammad Sajjad "Saj" Alam (born 5 January 1947) is an American physicist born in British India (Pakistan after 1947, and Bangladesh after 1971).
His work has focused on particle physics and computational physics.
He has played a significant role in several major particle physics experiments (the Mark II, CLEO, GEM, BaBar, ATLAS collaborations) that have led to new discoveries in the area of high-energy particle physics.