Hafnium acetylacetonate, also known as Hf(acac)<sub>4</sub>, is a coordination compound with formula Hf(C<sub>5</sub>H<sub>7</sub>O<sub>2</sub>)<sub>4</sub>. This white solid is the main hafnium complex of acetylacetonate. The complex has a square antiprismatic geometry with eight nearly equivalent Hf-O bonds. The molecular symmetry is D<sub>2</sub>, i.e., the complex is chiral. It is prepared from hafnium tetrachloride and acetylacetone, and base. Zr(acac)<sub>4</sub> is very similar in structure and properties.
Along with titanium tetrabutoxide (TBT), hafnium acetylacetonate serves as a catalyst for the production of poly(butylene terephthalate).