Sadd (, meaning "dam", "wall", or "rampart") may refer to: Sadd-e Chamran Sadd-e Ekbatan Sadd-e Kalateh Sadd-e Karun Chahar Sadd-e Kharu Sadd-e Kheyrabad Sadd-e Shavur Sadd-e Toroq
See also SADD (computing), a sideways bit addition instruction in Donald Knuth's MMIX implementation Students Against Destructive Decisions, a students organization