Manganese stearate is a metal-organic compound, a salt of manganese and stearic acid with the chemical formula C36H70MnO4.

[3] Manganese stearate is synthesized by the reaction of stearic acid with sodium hydroxide, followed by reacting with manganese chloride.

[4] Also, the reaction of manganese(II) acetate with stearic acid.

[5] The compound forms pale pink powder.

[6] Also as an oxidant additive for oxo-biodegradable polymers (for example, high-density polyethylene).