Catherine Crawley - who is in her late fifties - was last seen at St Alphonsus Road in Dundalk yesterday morning at around 11am.
She's described as being 5 foot 5 inches in height, has light brown bobbed hair and wears glasses.
When last seen she was wearing a three quarter length Khaki jacket, black trousers and white runners.
Advertisement
Gardai are appealing to anyone who may have seen Catherine or has any information to contact Dundlak Garda Station.