The ionic title complex, [Ni(C(2)H(8)N(2))(3)](SiF(6)), is built up of [Ni(en)(3)](2+) complex cations (en = 1,2-diamino-ethane) and hexa-fluoridosilicate anions. Single crystals of the title complex were isolated from an aqueous-ethano-lic Ni(2+)-en-SiF(6) (2-) system. The Ni(II) and Si atoms are each located on a special position with site symmetry 3.2. The Ni(II) atom coordination sphere is octa-hedrally deformed, being coordinated by three chelating diamine ligands with an Ni-N distance of 2.1233 (18) Å. The crystal packing of the respective ions corresponds to the structure type of the hexa-gonal form of BN. Beside ionic forces, the packing is governed by N-H⋯F hydrogen bonds, which lead to the formation of hydro-phobic channels running along the 6(3) screw axis. The structure was refined as an inversion twin [0.49 (3): 0.51 (3)].