15-year-old Kelly Adebutu has been missing from her home since Sunday.
She is described as being 5 foot 2 in height, with braided, wine coloured hair, and was last seen at Woodford Park in Clondalkin.
Kelly was wearing a brown jacket, dark blue bottoms and black runners with silver markings when she disappeared.
Anyone with information is asked to contact Clondalkin Garda station on 01 6667600, the Garda confidential telephone line 1800 666 111 or any Garda station.