The title compound, μ-cyano-1:2κ2C:N-tetracyano-1κC-[3,7-bis(2-aminoethyl)-1,3,5,7-tetraazabicyclo[3,3,2]decane-2κ4N1,3,5,7]-nitrosyl-1κN-copper(II)iron(II) monohydrate, [CuFe(CN)5(C10H24N6)(NO)]·H2O, has been synthesized and structurally characterized; the Cu atom is five-coordinate and has a square pyramidal configuration. The [Fe(CN)5(NO)]2− anion uses the CN− ligand cis to the NO+ ligand to link to the Cu atom. The Cu—N≡C—Fe linkage is nonlinear, similar to that in other cyano-bridged bimetallic complexes.