(Cyclooctatetraene)iron tricarbonyl is the organoiron compound with the formula (C<sub>8</sub>H<sub>8</sub>)Fe(CO)<sub>3</sub>. Like other examples of (diene)Fe(CO)<sub>3</sub> complexes, it is an orange, diamagnetic solid. Although several isomers are possible, only the ÷<sup>4</sup>-C<sub>8</sub>H<sub>8</sub> complex is observed. The complex is an example of a ring-whizzer, since, on the NMR time-scale, the Fe(CO)<sub>3</sub> center migrates around the rim of the cyclooctatetraene ligand.