Bellaleenan (from Irish: Béal Átha an Líonáin meaning 'The Entrance to the Ford of the Gorge') 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.
Bellaleenan is bounded on the north by Culliagh and Torrewa townlands in Corlough parish, on the west by Drumlaydan townland in Corlough parish, on the south by Sraloaghan, County Leitrim and Ballymagirril townlands and on the east by Stranadarragh and Drumlougher townlands. Its chief geographical features are the River Blackwater, County Cavan, forestry plantations and dug wells.
Bellaleenan is traversed by minor roads and rural lanes.
The townland covers 222 statute acres.
The 1609 Baronial Map depicts the townland as part of the four polls of BMcGoagh (Ballemagoechan).
In the Plantation of Ulster by grant dated 13 March 1610, King James VI and I granted four polls of Ballemagoechan to Cahell M'Owen O Reyly. The four polls consisted of 1 in Bealaghlyan, 2 in Acoylagh and 1 in Cronarry, totalling 200 acres. The said Cathal O'Reilly was the nephew of two chiefs of the O'Reilly clan- Aodh Connallach mac Maolmhordha who was chief from 1565–1583 and Eamonn mac Maolmhordha who was chief from 1596–1601. He was also a brother of Cathaoir O'Reilly who received lands in Kildoagh townland and first cousin of Donill Backagh McShane O'Reyly who was simultaneously granted lands in Burren (townland).
An Inquisition of King Charles I of England held in Cavan Town on 31 March 1635 stated that Cahell O Reily was seized in his lifetime of, inter alia, one poll of Bealaghlynan. He died 1 January 1634 and his son Hugh O'Reily had reached his majority and was married.