The woman, who was in her 40s, was struck at Ballyhagan in Carbury yesterday evening.
Gardai and emergency services attended but she was pronounced dead at the scene - the car's occupants were uninjured.
The woman's body has been taken to Naas General Hospital where a post mortem will take place.
Gardai are appealing for witnesses to contact them.
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8:00pm - 10:00pm
Love Songs on the Coast
Sunny intervals
High: 21°C | Low: 16°C
Sunny intervals
High: 20°C | Low: 16°C
Sunny intervals
High: 24°C | Low: 16°C
Sunny intervals
High: 25°C | Low: 15°C
Sunny intervals
High: 27°C | Low: 16°C