Ruthmael (died 824) was Abbot and Bishop of Clonfert.
References Annals of Ulster at CELT: Corpus of Electronic Texts at University College Cork Annals of Tigernach at CELT: Corpus of Electronic Texts at University College Cork Revised edition of McCarthy's synchronisms at Trinity College Dublin. Byrne, Francis John (2001), Irish Kings and High-Kings, Dublin: Four Courts Press, Lysaght, Eamonn (1978), The Surnames of Ireland. , pp. 233–34.