Konnyaku (蒟蒻), also known as Konjac, Konjak, Devil's tongue, Voodoo lily or Snake palm, is a tubiferous plant grown in Japan used to create a flour of the same name. Can appear in Japanese entrées such as oden. Mottled grey in appearance and gelatinous in consistency. Taste is best described as nondescript.

Konnnyaku is made by mixing konnyaku flower with water and limewater. Hijiki is often added to add dark color to the mix. The mix is then boiled and solidified. A konnyaku made into noodle is called Shirataki, appear in foods such as sukiyaki.

Amorphophallus rivieri is a synonym for A. konjac.