The title compound, [Hg(C(6)H(5))(C(15)H(15)N(4)O(2)S)], shows the metal-phenyl moiety coordinated out of plane with the thio-carbazo-nate ligand by 43.84 (6)°. Important geometrical parameters include Hg-S = 2.3653 (10) Å, Hg-C = 2.058 (4) Å and S-Hg-C = 179.06 (11)°. There is a weak coordination of an N atom of the ligand to Hg [Hg-N = 2.725 (3) Å]. S⋯Hg inter-actions[3.2928 (10) Å] form chains along [001], stabilizing the crystal structure.