The Offaly club were too strong for Dunsany on Sunday.
Ballinagar are the Leinster Junior Football champions after a 2-9 to 0-8 win over Dunsany yesterday.
The Offaly intermediate title holders led the Meath club 2-6 to 0-4 at half time and saw out the game from there.
Ballinagar captain Geordie O'Meara played a starring role scoring 1-3.
The Connacht Junior champions in an All Ireland semi-final are next for the Offaly outfit.
Galway's Cheathrú Rua were 4-12 to 2-10 over Ballymote Round Towers of Sligo.