Llantrisant (; Welsh for "Parish of the Three Saints") is a hamlet in Anglesey, Wales. It is in the community of Tref Alaw, and was a community itself until 1984.
Its parish church is dedicated to Saints Afran, Ieuan, and Sanan. The parish's former church is now a protected building. Browne Willis and Sabine Baring-Gould considered "Afran" to be a corruption of Afan, a saint of Ceredigion and Brecknockshire. (The 16th-century MS 147 concurs, listing the church as dedicated to "Sannan and Afan and Evan".) St Afan was related to the Cuneddan dynasty of Gwynedd and was claimed as an ancestor by a 10th-century Ieuan martyred by Viking raiders.