The Faithful County bested Longford by a narrow margin on Sunday.
Offaly came away from Longford with a hard fought and nervy victory for the second time in four weeks on Sunday.
In March it was the league, on Easter weekend, it was the Leinster Football Championship.
The Faithful County won out by the narrowest of margins in Pearse Park where it finished 1-12 to 1-11.
Manager Martin Murphy credits his players' defensive ability for the victory:
Offaly’s quarter final is a meeting with Meath in Glenisk O’Connor Park in two week’s time.
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