Viskase (formerly Visking) is a global corporation based out of Lombard, Illinois, United States that supplies plastic, cellulose, and fibrous film and packaging to the food service industry, including casings for processed meats such as hot dogs and sausages.

Viskase has manufacturing facilities in the United States, Mexico, Brazil and France, as well as sales offices located around the world.

Viskase is a publicly traded company, using the stock symbol OTC Pink Limited: VKSC.

Erwin O. Freund, founder of what would become Viskase, sought a readily available replacement for animal intestine casing.

Upon creating a cellulose casing, using the "viscose" process (also used in rayon) he realized the product stuffed well, linked, and was able to withstand the smokehouse.