In the title complex, [HgI₂(C₂₁H₁₉N₅)₂], the Hg^II ion is located on a twofold rotation axis and is coordinated by two I atoms and two N atoms from two (E)-2-{5,5-di­methyl-3-[4-(1H-1,2,4-triazol-1-yl)styr­yl]cyclo­hex-2-enyl­idene}malono­nitrile ligands in a distorted tetra­hedral geometry. In the crystal, the mol­ecules are linked by inter­molecular π–π inter­actions between the triazole and benzene rings [centroid–centroid distance = 3.794 (3) Å] into a band extending in [010]. These bands are further connected by C—HN hydrogen bonds into a two-dimensional network parallel to (100).