Sodium tetrachloropalladate is an inorganic compound with the chemical formula Na2PdCl4. The compound crystallizes from water as a reddish-brown trihydrate (Na2PdCl4·3H2O), which is the commercially available form. According to X-ray crystallography, the PdCl42- centers adopt square planar molecular geometry with Pd-Cl distances of 231 picometers.