In the title compound, [ZnCl(2)(C(9)H(17)N(3)S)(2)], the Zn(II) atom is four-coordinated by two N atoms from two 5-heptyl-1,3,4-thia-diazol-2-amine ligands and two Cl atoms in a distorted tetra-hedral geometry. The thia-diazole rings are oriented at a dihedral angle of 84.87 (4)°. Intra-molecular N-H⋯Cl inter-actions result in the formation of two six-membered rings having envelope and planar conformations. In the crystal structure, inter-molecular N-H⋯N and N-H⋯Cl inter-actions link the mol-ecules into a three-dimensional network. π-π contacts between thia-diazole rings [centroid-centroid distance = 3.602 (1) Å] may further stabilize the structure.