The victory sets up a semi-final clash with the Stormers next weekend.
Leinster booked their place in the United Rugby Championship semi-finals with a commanding 59-10 victory over the Lions at the Aviva Stadium.
Kildare's Sam Prendergast played a leading role in the win, scoring a second-half try and adding seven conversions in an impressive 19-point haul.
The out-half controlled proceedings throughout as Leinster bounced back strongly from last weekend's Champions Cup disappointment.
Fellow Kildare man Jimmy O'Brien also got on the scoresheet, crossing in the second half after another lively display in the Leinster backline.
James Lowe stole the headlines on his 100th appearance for the province, scoring twice to become Leinster's all-time leading try scorer with 71 tries.
The victory sets up a semi-final clash with the Stormers next weekend.
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