Isinglass is a material prepared from the air bladders of fish and used for various functions including beer making as a flocculator, to make gelatinous substances, an egg preservative and for parchment conservation.
Isinglass may also refer to:
Mica, a phyllosilicate mineral of aluminium and potassium. Sheet mica is sometimes used to make small windows Isinglass (horse), a British Thoroughbred racehorse Isinglass River, in New Hampshire, United States Project Isinglass, a United States Central Intelligence Agency aircraft study