Lutetium(III) acetate is the acetate salt of lutetium with the chemical formula of Lu(CH3COO)3.

Lutetium(III) acetate can be prepared through neutralisation, where a lutetium salt reacts with acetic acid to produce lutetium acetate and water: Lutetium(III) acetate also can be obtained by reacting lutetium oxide with gaseous acetic acid[1] or 50% acetic acid solution.

[2] Lutetium(III) acetate is a water-soluble salt that forms colorless crystals.

[citation needed] Lutetium(III) acetate reacts with ammonium fluoride to produce lutetium fluoride: The F− formed by the hydrolysis of fluoroborates (such as [BMIM]BF4)[3] can also precipitate with Lu3+.

[4] Reaction with phosphoric acid to produce lutetium phosphate:[5]