Modulin may refer to: Modulen, The brand of dietary supplement by Nestlé designed for persons with Crohn's disease Phenol-soluble modulin, a family of protein toxins Toll-like receptor and TLR 2, proteins of which some were previously classified as "modulins" Nucleomodulin, proteins that enter the nucleus of eukaryotic cells A musical instrument that is a monophonic analogue homebuilt theremin/violin-esque synthesizer, invented by the band Wintergatan