In the title complex, [Fe(C2O4)(C5H4N2O4)]n, the FeII ion is coordinated by two oxalate anions and a pyrimidine-2-carboxylic acid ligand in a slightly distorted octahedral geometry. Each oxalate anion chelates to two FeII ions, forming chains along the a axis. The chains are further connected by O—H⋯O and C—H⋯O hydrogen bonds, stabilizing the structure. An intramolecular O—H⋯N interaction results in a five-membered ring
