氧化钆，化学式Gd₂O₃。

白色无味无定形粉末，不溶于水，溶于酸。露置于空气中时易吸收空气中的水分和二氧化碳而变质。

Gadolinium(III) oxide (archaically gadolinia) is an inorganic compound with the formula Gd₂O₃. It is one of the most commonly available forms of the rare earth element gadolinium, derivatives of which are potential contrast agents for magnetic resonance imaging.