The molecular structure of the title compound, [Ni(C₁₀H₈N₂)₂(H₂O){Cr₂O₇}], contains an Ni^IIatom with a distortedcis-octahedral coordination formed by two chelating bipyridine (bipy) ligands [mean Ni—N_bipy = 2.068 (3) Å], one water molecule [Ni—O = 2.086 (3) Å] and an O atom of the dichromate anion [Ni—O = 2.083 (2) Å]. One of the water H atoms is involved in the intramolecular hydrogen bond with the terminal O atom of the dichromate ligand [O...O 2.743 (5) Å], whereas its second H atom participates in the intermolecular hydrogen bonding [O...O 2.688 (4) Å]; the latter is responsible for the formation of the infinite chains stretching along the polarcaxis of the crystal.