The gens Suellia was a minor plebeian family at ancient Rome. Members of this gens first appear in the time of the Republic, but few are mentioned by ancient writers. Others are known from inscriptions. The Suellii are easily confused with the Suilii, although there is a possibility that the two gentes were in fact identical. The most illustrious of this family was probably Gnaeus Suellius Rufus Marcianus, who was consul during the reign of Commodus.