The vaṁśa (vamsa) of Udāvahi (Udavahi) is one of the ṛṣivaṁśa(s) (rishivamsa; biological or disciple -wise order of sages) belonging to the gotra (clan) of Maharṣi (Maharshi; Great Sage) Viśvāmitra (Viswamitra). Udāvahi (Udavahi) was a clan-founder of the order of Viśvāmitra.