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The title compound, C10H15N2+·H2PO4−, is built up from 4-phenylpiperazin-1-ium cations and dihydrogen phosphate anions. The interconnection between two adjacent anions is assured by two strong O—H...O hydrogen bonds, which lead to the formation of infinite wave-like chains which spread along the a axis. The organic cations connect these chains via N—H...O hydrogen bonds. The crystal cohesion and stability are ensured by electrostatic and van der Waals interactions which, together with N—H...O and O—H...O hydrogen bonds, build up a two-dimensional network.