Tuathflaith

() is an Irish language feminine given name. Alternate spellings include and . As the name derives from the male given name meaning "ruler of the people", is understood to mean "princess of the people". More specifically, Tuathflaith is composed of the Old Irish elements túath "people, country" and flaith "ruler, sovereign, princess".

Notable people Tuathflaith ingen Cathail (more commonly Taileflaith), Queen of Leinster, fl. 728, d. 749-754.

See also List of Irish-language given names