Streptogrisin B (, Streptomyces griseus protease B, pronase B, serine proteinase B, Streptomyces griseus proteinase B, Streptomyces griseus proteinase 1, Streptomyces griseus serine proteinase B) is an enzyme. This enzyme catalyses the following chemical reaction
This enzyme is isolated from Streptomyces griseus.