In chemistry, and in particular, in organometallic chemistry, a metallocene is a compound consisting of an aromatic organic ligand bound to a metal.

A key feature of metallocenes is planar aromatic organic ligands in which multiple of the carbon atoms in the ring form metal-carbon bonds that are equivalent.

The prototypical metallocene is ferrocene, consisting of two cyclopentadienyl rings bound on opposite sides of a central iron atom, forming an organometallic sandwich compound.