Three types of polymeric metallocarbenes were synthesized: heterocarbene, diarylcarbene, and alkylidene complexes. They were thermally more stable than their low molecular weight analogs. They exhibited13C-NMR signals for the carbene carbons at very low magnetic field. They were characterized by typical metallocarbene reactions, such as nucleophilic substitution and oxidation, as well as cyclopropanation of unsaturated carboxylates. Thus, metallocarbenes, as an important category of organometallic compounds or intermediates, have gained entry to polymer chemistry.