LÉ Ciara (P42) is a Peacock-class patrol vessel in the Irish Naval Service. Like the rest of her class, she was originally designed for use by the British Royal Navy in Hong Kong waters, and was delivered in 1984 by Hall, Russell & Company as HMS Swallow (P242) She passed to the Irish Naval Service in 1988 and was commissioned under her current name by the then Taoiseach Charles Haughey on 16 January 1989. She is the sister ship of Orla.
This ship takes her name from a Tipperary saint born around the year 611 who, after taking religious vows in her teens, founded a convent in Kilkeary, near Nenagh. The ship's coat-of-arms depict three golden chalices which represent the three ancient dioceses among which Tipperary was divided. Also featured is a Celtic cross as a representation of the North Cross at Ahenny, County Tipperary. The coat of arms incorporates the Tipperary colours of Blue and Yellow as well as the background or field colours of the Tipperary Arms which is Ermine - white with a pattern of black arrowhead shaped points.