Tetha (Cornish: Tedha; Welsh: Tedda), also known as Teath (/tɛθ/), Tecla, and by a variety of , was a 5th-century virgin and saint in Wales and Cornwall. She is associated with the parish church of St Teath in Cornwall. Baring-Gould gives her feast day as 27 October, but this has been called a mistaken conflation with Saint Ia. In 1878, it was held on the movable feast of Whit Tuesday. Other sources place it on 1 May, 6 September, and (mistakenly) 15 January. It is no longer observed by either the Anglican or Catholic church in Wales.