We present fully differential next-to-leading order results for Higgs production in association with a Z boson in gluon fusion. Our two-loop virtual contributions are evaluated numerically using sector decomposition, including full top-quark mass effects, and supplemented at high p_T by an analytic high-energy expansion to order m⁴_Z,m⁴_H,m³²_t. Using the expanded results we also present a study of the top-quark mass scheme uncertainty at large p_T.