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In the title compound, C5H9NO2·2C6H5NO3, the pyrrolidine ring of the pyrrolidinium-2-carboxylate zwitterion adopts a twisted conformation on the –CH2—CH2– bond adjacent to the N atom. The mean plane of this pyrrolidine ring forms dihedral angles of 25.3 (3) and 32.1 (3)° with the two nitrophenol rings. An intramolecular N—H...O hydrogen bond occurs in the pyrrolidinium-2-carboxylate molecule. In the crystal, molecules are linked via O—H...O and N—H...O hydrogen bonds, enclosing R32(8) ring motifs, forming chains running parallel to the a axis. These chains are further cross-linked by O—H...O and C—H...O hydrogen bonds, forming undulating two-dimensional networks lying parallel to (001).