Mercury iodide can mean either of the following chemical compounds:

Mercury iodide may refer to:

Diamond Rubber experimented with various additives, such as mercury iodide and aniline, in an attempt to improve the properties of lower quality rubber.

Silver mercury iodide] (AgHgI) is yellow at low temperatures and orange above 47-51 C, with intermediate yellow-orange states.

Hg + 2 I HgI Orange mercury iodide solid is precipitated until the mercury is used up.

Coccinite is a rare mercury iodide mineral with chemical formula of HgI, mercury(II) iodide.

It also reacts with many mercury compounds, giving the corrosive compound mercury iodide, as well as with many metals, making it unsuitable for disinfecting metal piercings.

Cuprous mercury iodide (CuHgI) undergoes a phase transition at 67 C, reversibly changing from a bright red solid material at low temperature to a dark brown solid at high temperature, with intermediate red-purple states.