Knockadoois is a townland in the Civil Parish of Tomregan, Barony of Knockninny, County Fermanagh, Northern Ireland.
The townland name is an anglicisation of the Gaelic placename “Cnoc a Duais” which means ‘Hill of the Reward’.
It is bounded on the north & west by Gortineddan townland, on the east by Carickaleese townland and on the south by the international border with County Cavan and the Republic of Ireland. Its chief geographical features are the Shannon-Erne Waterway, spring wells and a drumlin hill reaching to 50 metres above sea-level.
The townland is traversed by Cloncoohy Lane.
Knockadoois covers an area of 155 statute acres.
The townland formed part of the ballybethagh of Calvagh in medieval times. At the beginning of the 17th century it was owned jointly by Bryan McPhilip O’Reyly and Edward Rutlidge but was confiscated by the Crown in the 1609 Ulster Plantation and it formed part of the half-territory of Aughrin which was granted to Sir Hugh Culme in 1610. Culme later relinquished his claim to the Crown, perhaps because there was confusion at the time as to whether the townland formed part of County Fermanagh or County Cavan. By an order of the Lord Deputy dated 14 October 1612 the townland was granted, inter alia, to Lady Margaret O’Neill, the widow of Sir Hugh Maguire deceased. In 1641 and also in 1670 it was owned by Sir William Balfour (general).
The Tithe Applotment Books for 1827 list the following tithepayers in the townland- Foster, Kells, Hayes, Drum, Ross, Panil, Murphy, Brady, Elliott.
The population of the townland in the 1841 census was 96.
Griffith's Valuation of 1857 lists nineteen occupiers in the townland.
In the 1901 census of Ireland, there are ten families listed in the townland.
In the 1911 census of Ireland, there are thirteen families listed in the townland.
The only historic site in the townland is Knockadoois Springs House.