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In the mononuclear title complex, [Ag(NO3)(C10H6N4)2], two κ2N:N′-chelating 5-(pyridin-2-yl)pyrazine-2-carbonitrile ligands surround the AgI atom, forming an N4O square-pyramidal coordination geometry with one nitrate anion bonding at the apical site. The two heterocyclic rings of the 5-(2-pyridin-2-yl)pyrazine-2-carbonitrile ligand are almost coplanar [dihedral angle = 5.63 (8)°], and the two chelating ligands are in an anti relationship. The mononuclear units are interconnected along [010] through C—H...O(nitrate) and C—H...N(cyano) interactions, forming an infinite chain. The mononuclear units are stacked along the a axis and interconnected via intermolecular π–π stacking interactions between adjacent pyridine and pyrazine rings [centroid–centroid distances = 3.984 (2) and 3.595 (3) Å], thus forming a three-dimensional supramolecular structure.