Doncaster police are appealing for help to locate Marilyn White, who has been missing since Wednesday.
Officers say they are growing increasingly concerned for the 55-year-old.
Marilyn was last seen at her home address in Bawtry Road, Hatfield Woodhouse, at around 8.30pm on November 26.
She is described as white, of a thin build and approximately 5ft 9ins tall.
She has brown hair which is greying that she wears in a ponytail.
She is believed to be wearing tracksuit bottoms and a rugby shirt.
Anyone with information or anyone who may have seen Marilyn is asked to call the Police on 101 quoting incident number 748 of November 27 2014.