Lethlobar mac Loingsig (died 873) was a Dál nAraidi king of Ulaid, in medieval Ireland.
[1] He belonged to the main ruling dynasty of the Dál nAraidi known as the Uí Chóelbad based in Magh Line.
[4] There was a branch of the Dal nAraidi in west County Down in the south, the Uí Echach Cobo, but they were always referred to as Kings of Coba (or Cuib) in the annals.
[7] His son Cenn Étig mac Lethlobuir (died 900) was also a ruler of all Ulaid and succeeded him as King of Dál nAraidi.
His daughter Barrdub was married to Áed mac Eochocáin (died 919), a Dál Fiatach king of Ulaid.