The 18 year old girl suffered serious injuries in the collision on Saturday night.
Police in Aberystwyth are appealing for witnesses to a crash which killed a teenage girl.
The 18 year old was a passenger in one of two cars which were in collision at around 10pm Saturday night on the A487 at Commins Coch.
She was taken to hospital - along with a number of other people - but died of her injuries.
Anyone travelling along this stretch of road at the time of the collision who had dash cam footage, or saw the collision or the vehicles involved, is asked to contact the Serious Collision Investigation Unit.
You can report information online at: http://bit.ly/dppReportOnline, by email at: email@example.com or by calling 101.