Ballymagirril (from Irish: Baile Mhig Iriail meaning 'McGirl's townland') 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.
Ballymagirril is bounded on the north by Bellaleenan townland, on the west by Sraloaghan townland in County Leitrim, on the south by Greagh townland and on the east by Stranadarragh and Cornagunleog townlands. Its chief geographical features are the River Blackwater, County Cavan, spring wells and dug wells.
Ballymagirril is traversed by minor roads and rural lanes.
The townland covers 157 statute acres.
The McGirl family probabably owned the townland. The name is still common in the area, e.g. John Joe McGirl.
Until the 19th century the modern townland of Greagh formed a sub-division of Ballymagirril.
The 1609 Baronial Map depicts the townland as B:McGirrill.
The 1665 Down Survey map depicts it as Ballymagurke.
William Petty's 1685 map depicts it as Ballimagurt.
In the Plantation of Ulster by grant dated 29 April 1611, along with other lands, King James VI and I granted four polls of Ballymagirrell to the McGovern Chief, Phelim Magawran, but it is probable that the lands had been in the possession of the McGovern clan for several hundred years before this and it was just a Surrender and regrant confirming the existing title to the McGoverns.