Ballynamaddoo (from Irish: Baile na Mada meaning 'Town of the Dogs (or Foxes)') 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.
Ballynamaddoo is bounded on the northwest by Gortnavreeghan townland, on the west by Bawnboy townland, on the south by Corrasmongan and Killycrin townlands and on the east by Gowlagh North and Corneen townlands. Its chief geographical features are Slieve Rushen mountain on whose western slope it lies, mountain streams, mountain bogs, forestry plantations and dug wells. It forms part of the Slieve Rushen Bog Natural Heritage Area [8]
Ballynamaddoo is traversed by minor roads and rural lanes.
The townland covers 234 statute acres.
Until the Cromwellian Act for the Settlement of Ireland 1652, Ballynamaddoo formed part of the modern townland of Corrasmongan and its history is the same till then.
An Inquisition held at Belturbet on 12 June 1661 found that George Greames was seized of, inter alia, Ballyoghnemoynagh and he died 9 October 1624. By his will dated 1 May 1615 he left his lands to his son and heir William Greames then 30 years old (born 1594) and unmarried. After the Cromwellian Act for the Settlement of Ireland 1652 the Graham family were still in possession of Ballynamaddoo.
In the Hearth Money Rolls of 1662 there was nobody paying the Hearth Tax in Ballynamadoo.
The Tithe Applotment Books for 1827 list fourteen tithepayers in the townland.