Zwieback is a type of crispy, sweetened bread, made with eggs and baked twice. It is sliced before it is baked a second time, which produces crispy, brittle slices that closely resemble melba toast. Zwieback is commonly used to feed teething children.

The name comes from German zwei ("two") or zwie ("twi-"), and backen, meaning "to bake". Zwieback hence literally translates to "twice-baked."

Zwieback originated in East Prussia, Germany. The Mennonites brought Zwieback to Russia (now Ukraine), during and after the Russian Revolution Mennonites brought Zwieback to Canada, and other parts of the world.

To make a "zwieback cake," zwieback toast is ground up into a fine powder and baked into tortes. The tortes are put together with banana slices and whipped cream.

The Nabisco (division of Kraft) product of this name has been discontinued (July 2008)

Zwieback