The collision -between a van and a motorcycle – happened on the N80 Portlaoise to Carlow road, close to Arles at around 6 o'clock.
Two men, the driver and passenger of the motorcycle, believed to be in their late 20s or 30s, were fatally injured.
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The van driver was taken to the Midlands Regional Hospital in Portlaoise but is not thought to be seriously injured.
Gardaí are appealing for witnesses to contact Portlaoise Garda Station.