The reaction of zinc(II) acetate dihydrate and the tetra-dentate N-Oxo-2-acetylpyridine 4N-methylthiosemicarbazone (H4MLO) produces the novel complex [Zn(C9H11N4OS)2·H2O] (1). The complex crystallizesoin the orthorhombic space group Pbca with a = 15.871(3), b =16.890(3), c = 17.189(3) Å ,V - 4608(1) Å3, Z = 8 . The Zn(II) ion is tetra-coordinated via the thiolate sulfur atom and the azomethine nitrogen atom of two deprotonated ligands. In the solid state, 1 is polymerized via hydrogen bonds with a water molecule of crystallization.