Dibenzylideneacetone or dibenzalacetone, often abbreviated dba, is an organic compound with the formula C17H14O.

[5] This reaction, which proceeds via the intermediacy of benzylideneacetone, is often performed in organic chemistry classes,[6] and is called Claisen-Schmidt condensation.

Prolonged exposure to sunlight initiates [2+2] cycloadditions, converting it to a mixture of dimeric and trimeric cyclobutane cycloadducts.

[7] Dibenzylideneacetone is used as a component in sunscreens and as a ligand in organometallic chemistry.

It is a labile ligand that is easily displaced by triphenylphosphine, hence it serves a useful entry point into palladium(0) chemistry.