St. Begnet (7th century?), also Begneta, Begnete, Begnait or Becnait is a patron saint of Dalkey, Ireland. She is noted as a "virgin, not a martyr." Her feast day is November 12. Two ruined churches in Dalkey are named for Begnet, one on Dalkey Island, and the other near the 15th-century stone townhouse now serving as Dalkey Castle and Heritage Centre, in the area known as Kilbegnet. A holy well located near the martello tower on the island is also associated with her; as the Irish playwright Hugh Leonard observed:
The name has been incorrectly understood as a corruption of St. Benedict. The stories associated with her suggest that she has also been identified with Saint Bega or other virgin saints named as Begha or Becga in Irish calendars.
Begnet is named in the calendars of two manuscript breviaries which in the 19th century were held by the Library of Trinity College, Dublin. One had belonged to the church of Clondalkin, and the other to the parish church of St. John the Evangelist, Dublin, but she is not mentioned in the Martyrology of Oengus.