Nickel formate is the nickel salt of formic acid with the chemical formula Ni(HCOO)2.

[3] As a dihydrate, nickel formate is a green, odorless, non-flammable solid that is sparingly soluble in water.

[2] The compound has a monoclinic crystal structure.

[3] The anhydride forms on careful heating at 130–140 °C.

[6] When heated in a vacuum to 300 °C, pure nickel is formed:[5] Such fine powders are useful as hydrogenation catalysts.