The son of missing woman, Marian Power (60), is appealing to anyone with information to come forward.
She was last seen in the Lucan area of Dublin at around 9am on Monday morning.
She is described as being five foot two inches, of slim build with brown hair.
Her missing poster | Image: Facebook/Find Marian Power
When last seen she was wearing brown boots, dark blue waterproof leggings, a dark navy fleece and a multi-coloured woolly hat.
Anyone with information is asked to contact Lucan garda station at 01-666-7300 or the Garda Confidential Line on 1800-666-111.
A Facebook page has also been set up to help with the search.
Her son, Almar, says the family are very concerned.