In the title compound, [Zn(C2H8N2)2(H2O)2](C10H8NO3S)2·2H2O, the ZnII cation lies on an inversion centre and has a distorted octahedral coordination geometry, defined by four N atoms from two ethylenediamine ligands and two water O atoms. In the crystal structure, pairs of 4‐aminonaphthalene‐1‐sulfonate anions are connected via N—H...O hydrogen bonds to form centrosymmetric R22(16) rings. Cations, anions and water molecules are further connected by N—H...O, O—H...O and O—H...N hydrogen bonds and π–π stacking interactions [with a centroid‐to‐centroid distance of 3.5099 (13) Å] to form a three‐dimensional network.