Both sides have impressed on their way to the county semi-finals.
The first of two semi-finals in the Laois Senior Hurling Championship sees last year's beaten finalists against one of the perennial title favourites.
After losing their first county final in 74 years by 14 points to Camross, Abbeyleix are back on their feet.
They booked their place in the last four with an emphatic 2-18 to 2-9 win over Portlaoise in their quarter-final.
Rathdowney Errill are looking to make their first championship decider since winning the title in 2019.
They topped their group with wins over Camross, Castletown, and a draw against Portlaoise.
Midlands 103's Jack Nolan says both clubs have a lot to drive them on this weekend:
The action in O'Moore Park gets underway at 2.15pm on Sunday.
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