Ytterbium(III) hydroxide is an inorganic compound with the chemical formula Yb(OH)<sub>3</sub>.
Ytterbium(III) hydroxide dissolves in acid to form a ytterbium salt:
Ytterbium(III) hydroxide is decomposed by heat, first forming YbO(OH), and continuing to heat to obtain Yb<sub>2</sub>O<sub>3</sub>. It reacts with aluminum hydroxide oxide (AlOOH) at 1400 ðC to obtain Yb<sub>3</sub>Al<sub>5</sub>O<sub>12</sub>.