Iron(II) fumarate, also known as ferrous fumarate is the iron (II) salt of fumaric acid, occurring as a reddish-orange powder, used to supplement iron intake. It has chemical formula C₄H₄FeO₄.

Iron (IPA) is a chemical element with the symbol Fe (Latin: ferrum) and atomic number 26. Iron is a group 8 and period 4 metal. Iron is a lustrous, silvery soft metal. Iron and nickel are notable for being the final elements produced by stellar nucleosynthesis, and thus are the heaviest elements which do not require a supernova or similarly cataclysmic event for formation. Iron and nickel are therefore the most abundant metals in metallic meteorites and in the dense-metal cores of planets such as Earth.