Tiranny (from Irish Tuath Threana, meaning 'territory of Trena')[1][2] is a barony in County Armagh, Northern Ireland.

The form Tiranny was created by the Ordnance Survey and led to the incorrect conjecture by some such as John O'Donovan that the first element of the name derived from the Irish word tír, meaning "country".

[2] Older phonetic forms of Tuatha Threna included Toaghrany, Toyghrayny, Toaghraine, Toaghranye, Towrany, Tuterany, Toghrany, Toorany, Turrany, and Torany, all of which are found in records from the early seventeenth century.

In various Elizabethan maps of Ulster, they are recorded in the anglicised forms of O'Traney, O'Trany, Outraine, and Traney, before the term Tuath Threana was used.

[2] The name derives from the Irish Cluain Dabhail, which means "meadow of Dabhal", noted as the ancient name of the River Blackwater.