Killynaff (from Irish: Coill na ndamh, meaning 'Wood of the Oxen') is a townland in the civil parish of Templeport, County Cavan, Ireland. It lies in the Roman Catholic parish of Templeport and barony of Tullyhaw.
Killynaff is bounded on the north by Urhannagh, Bofealan and Drumane townlands, on the west by Cavanaquill and Crossmakelagher townlands and on the southeast by Lecharrownahone townland. Its chief geographical features are cow pastures. Killynaff is traversed by a minor road and rural lanes.
The townland covers 133 statute acres.
The 1609 Baronial Map depicts the townland as Killenaw. The 1665 Down Survey map depicts it as Killinought.
In the Plantation of Ulster by grant dated 23 June 1610, along with other lands forming the Manor of Calva, King James VI and I granted one poll of Killenenawe to Hugh Culme. In the same year Culme surrendered his interest to Walter Talbot of Ballyconnell. Talbot died on 26 June 1625 and his son James Talbot succeeded to the Ballyconnell estate aged just 10 years. An Inquisition held in Cavan on 20 September 1630 found that James Talbot was seized of one poll of Killnenawe, along with other lands. In 1635 James Talbot married Helen Calvert, the daughter of George Calvert, 1st Baron Baltimore of Maryland, USA. In the Cromwellian Act for the Settlement of Ireland 1652, James Talbot's estate was confiscated because he was a Catholic and he was granted an estate in 1655 at Castle Rubey, County Roscommon instead. He died in 1687. Talbot's land in Killynaff was distributed as follows-