Mercury(II) stearate is a metal-organic compound, a salt of mercury and stearic acid with the chemical formula C36H70HgO4.

The compound is highly toxic by inhalation, ingestion, and skin absorption.

[1] An exchange reaction of sodium stearate and mercury dichloride: Also, heating mercurious oxide with stearic acid.

[3] The compound forms yellow waxy substance.

[4] It is used as a germicide[1] and as a plasticizer in the production of ceramics.