Conaing mac Flainn (died 849) was a King of Brega from the Uí Chonaing sept of Cnogba (Knowth) of the Síl nÁedo Sláine branch of the southern Ui Neill. He was the son of Flann mac Congalaig (died 812), a previous king. He ruled from 839 to 849.

The Uí Chonaing sept had conquered the lands