In the title compound, [Ag(C(13)H(11)N(3)O(2))(2)(H(2)O)]NO(3), two N atoms from two pyridine rings of two N'-(2-hydroxy-benzyl-idene)isonicotinohydrazide ligands coordinate to the Ag(I) atom, forming a nearly linear geometry with an N-Ag-N angle of 171.63 (6)°; a water O atom is located at the apical site, completing the T-shaped coordination. The crystal structure is stabilized by extensive O-H⋯O, O-H⋯N and N-H⋯O hydrogen bonding.