The crystal structure of the title compound, [Zn(C2H8N2)3][MoO4], is composed of [MoO4]2- anions and [Zn(en)3]2+ complex cations (en is ethylenediamine), both with symmetry 2, which are held together in a three-dimensional network via hydrogen-bonding interactions. The [Zn(en)3]2+ cations in the crystal structure exhibit two configurations, viz. Lambda(deltadeltadelta) and Delta(lambdalambdalambda), as a pair of enantiomers.