Bis(cyclopentadienyl)zirconium(IV) dichloride, commonly known as zirconocene dichloride (Cp2ZrCl2), is an organometallic compound with the formula (C5H5)2ZrCl2. It is a diamagnetic, air- and moisture-sensitive solid that typically forms orange crystals. Its structure features a zirconium(IV) center sandwiched between two cyclopentadienyl (Cp) rings, with two chloride ligands completing the coordination sphere. This compound is a fundamental and versatile precursor in organometallic chemistry and materials science. Its primary industrial and research applications are as a catalyst or catalyst precursor. It is a key component in Ziegler-Natta type olefin polymerization catalysts, particularly when activated with methylaluminoxane (MAO), for the production of polyolefins. Furthermore, it serves as a crucial starting material for synthesizing other zirconocene derivatives, such as zirconocene hydrides and alkyls, which are important in organic synthesis for reactions like hydrozirconation of alkenes and alkynes. It is also investigated as a precursor for the chemical vapor deposition (CVD) of zirconium-containing thin films and coatings.