In the title compound, [Zn(SO₄)(C₁₈H₁₂N₆)(H₂O)₂]·2H₂O, the metal complex is monomeric, with an octahedral Zn^II centre coordinated by the tridentate ligand 2,4,6-tris(2-pyridyl)-1,3,5-triazine (tpt), two aqua molecules and a monodentate sulfate ion. A complex hydrogen-bonding scheme is built up out of the profuse availability of donors and acceptors (O–H⋯O/N and C–H⋯O) which, in addition to π–π interactions between tpt groups, define a three-dimensional assembly.