Chromium(III) hydroxide is a gelatinous green inorganic compound with the chemical formula Cr(OH)3.

It is a polymer with an undefined structure and low solubility.

[2] It is used as a pigment, as a mordant, and as a catalyst for organic reactions.

[citation needed] Pure Cr(OH)3 is as yet (2020) unknown among the mineral species.

However, three natural polymorphs of the oxyhydroxide, CrO(OH), are known: bracewellite, grimaldiite and guyanaite.