Cillíne mac Forannáin (died 652) was a king of the Uí Failge, a Laigin people of County Offaly.
He was the great grandson of a brother (Máel Uma) of Áed Rón mac Cathail (died 604), a previous king.
[1] He is listed as king in the Book of Leinster king list and is also mentioned in a poem in the genealogies about the royal fort at Rathangan, County Kildare.
[3] He was slain in internal conflict among the Uí Failge at the Battle of Cúil Corra.
Eventually his nephew Fland Dá Chongal became king.