Arylation of ferrocene with substituted biphenyldiazonium tetrafluoroborates afforded 4-bromo-, 4-nitro-, and 4-cyano-4'-ferrocenylbiphenyls. 4-Nitro- and 4-cyano-4'-ferrocenylbiphenyls were studied by X-ray diffraction analysis. In the crystals of 4-nitro-4'-ferrocenylbiphenyl, the molecules are linked via stacking pi-pi interactions.