Tonnagh may refer to the following places in Northern Ireland:
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Glenconkeyne is an ancient Irish district in what is now southern County Londonderry, Northern Ireland. Glenconkeyne formed the western portion of the former barony of Loughinsholin, with the ancient districts of Clandonnell, Killetra, and Tomlagh comprising the rest. The area Glenconkeyne covered corresponds to the present-day parishes of Ballynascreen, Desertmartin, and Kilcronaghan.
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.
Tonnagh Beg is a townland in County Tyrone, Northern Ireland. It is situated in the barony of Clogher and the civil parish of Donacavey and covers an area of 227 acres.