There are 1 book by Ruairi O'Cashel on BookOrb. A strong starting point is Erin Go Bragh III (2013). The bibliography below is in publication order, with series grouped in reading order.
Standalone books
Frequently asked questions
How many books has Ruairi O'Cashel written?
BookOrb lists 1 book by Ruairi O'Cashel.
Where should I start with Ruairi O'Cashel?
A good starting point is Erin Go Bragh III (2013).
What is the Ruairi O'Cashel books in order list?
In publication order: 1. Erin Go Bragh III (2013).