Elsa B. Dorfman was an American portrait photographer. She worked in Cambridge, Massachusetts, and was known for her use of a large-format instant Polaroid camera.

Large format photography refers to any imaging format of 9 cm × 12 cm or larger. Large format is larger than "medium format", the 6 cm × 6 cm or 6 cm × 9 cm size of Hasselblad, Mamiya, Rollei, Kowa, and Pentax cameras, and much larger than the 24 mm × 36 mm frame of 35 mm format.