Nickel nitrate is the inorganic compound Ni(NO₃)₂ or any hydrate thereof. The anhydrous form is not commonly encountered, thus “nickel nitrate” usually refers to nickel(II) nitrate hexahydrate. The formula for this species is written in two ways: Ni(NO₃)₂6H₂O and, more descriptively [Ni(H₂O)₆](NO₃)₂.

Formula: Ni(NO3)2