A new NiO-based material Pb₂Ni(PO₄)₂ was obtained by a conventional solid-state reaction in air. The crystal structure exhibits both corner- and edge-sharing {Ni–O–P} bonds in the system. Magnetic properties were investigated by means of magnetic susceptibility, magnetization, and heat capacity measurements. The results show a typical three-dimensional antiferromagnetic ordering below ∼4 K and a field-induced spin-flop transition below the Néel temperature.