Mary Martin was last seen in the Blacks Road area at about 1 pm on Saturday 20 May.
The 65-year-old was reported missing two days later and officers are asking anyone who may know where she is to contact them.
PSNI Sergeant Glenn Kernohan said: “Mary is described as being of medium build, approximately 5ft 2ins in height, with short grey hair.
“When last seen, she was wearing a baggy grey blouse and jeans and was carrying a number of her belongings.
“Mary, or anyone who knows of her whereabouts, is asked to contact the police at Woodbourne Police Station on the non-emergency number 101.”