Thulium(III) acetate is the acetate salt of thulium, with the chemical formula of Tm(CH<sub>3</sub>COO)<sub>3</sub>. It can exist in the tetrahydrate or the anhydrous form.
Thulium(III) acetate reacts with iron acetylacetonate at 300 ðC, which can form the hexagonal crystal TmFeO<sub>3</sub>.
Reacting thulium(III) acetate with trifluoroacetic acid will produce thulium trifluoroacetate: