A phosphorus-containing hybrid porphyrin was successfully prepared via the BF3-promoted dehydrative condensation between sigma(4)-phosphatripyrrane and 2,5-bis[hydroxy(phenyl)methyl]thiophene. The NMR and UV-vis absorption spectra, electrochemical measurements, and DFT calculations revealed that the sigma(3)-P,N-2,S-hybrid porphyrin exhibits high aromaticity as an 18 pi-electron system in terms of both geometric and magnetic criteria.