Tonnagh More is a townland in County Tyrone, Northern Ireland.
It is situated in the barony of Omagh East and the civil parish of Donacavey and covers an area of 317 acres.
[1] The name derives from the Irish: Tamhnach mor (Large green field or great field).
[2] In 1841 the population of the townland was 116 people (20 houses) and in 1851 it was 115 people (21 houses).
[3] The townland contains one Scheduled Historic Monument: a Rath (grid ref: H4020 5967).