Bismole is a theoretical heterocyclic organic compound, a five-membered ring with the formula C4H4BiH.

It can be viewed as a structural analog of pyrrole, with bismuth replacing the nitrogen atom of pyrrole.

The unsubstituted compound has not been isolated due to the high energy of the Bi-H bond.

Substituted derivatives, which have been synthesized, are called bismoles.

Bismoles can be used to form ferrocene-like sandwich compounds.