Forbassach Ua Congaile (died 714) was a king of the UÃÂ Failge, a Laigin people of County Offaly.
The king lists in the Book of Leinster give him a reign of three years, giving a possible reign of 711âÂÂ714. He was related to his predecessor Fland Dá Chongal but the exact relationship is unclear. The UàFailge had a traditional hostility to the rulers of Uisnech. In 714 he took advantage of the attack by the SÃÂl nÃÂedo Sláine on Murchad Midi of Uisnech to attack Meath. However, he was defeated and slain by the men of Meath at the Battle of Garbsalach.
The descendants of Fland Dá Chongal, known as the UàFlaind, dominated the kingship after his death.