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.
Local TD Helps Gardaí To Remove Knife From A Distressed Man's Possession Near Leinster House
Wicklow Wexford Fine Gael TD steps in help dislodge a knife from the possession of a man who appeared distressed on Kildare street in Dublin this week
Fire Crews Successfully Battle Major Gorse Fire In Glencree National Park Overnight
Garda Renew Appeal For Info On Paul 'Frank' Byrne Found Murdered In Blessington
Nearly 1,000 Wicklow Children in Oversized Primary School Classes, TD Reveals
Malcolm Byrne calls for urgent teacher recruitment as figures show 984 pupils in classes of 30 or more across the county
Uisce Éireann Warning As Six-Week Hosepipe Ban Takes In Stretches Along The N11 In Wicklow
Sunny intervals
High: 20°C | Low: 14°C
Sunny intervals
High: 19°C | Low: 13°C
Sunny intervals
High: 21°C | Low: 11°C
Sunny intervals
High: 23°C | Low: 12°C
Sunny intervals
High: 25°C | Low: 12°C
