The crystal structure of the title salt, [Fe(C5H5)(C15H19NO)](C4H5O2), consists of discrete ammonium and carboxylate ions, which associate into infinite chains parallel to [100] by means of N-H...O and O-H...O interactions. These chains are further cross-linked into a three-dimensional network by additional C-H...O contacts and by offset pi-pi stacking interactions of inversion-related aromatic rings [centroid-centroid distance = 3.7040 (14) angstrom].