Lethlobar mac Loingsig

Lethlobar mac Loingsig (died 873) was a Dál nAraidi king of Ulaid, in medieval Ireland. He was the grandson of Tommaltach mac Indrechtaig, a previous king of Ulaid. He belonged to the main ruling dynasty of the Dál nAraidi known as the Uí Chóelbad based in Magh Line. He ruled as king of the Dál nAraidi from 824/849-873 and as leth-ri (co-king) of Ulaid from 857 to 871 and sole king of Ulaid from 871 to 873.