Agnes Grainger Stewart (26 April 1871 – 25 September 1956) was a Scottish writer.
Her father was Sir Thomas Grainger Stewart, an eminent physician, and her mother was Jessy Dingwall Fordyce McDonald.
Otherwise she seems to have led a sheltered life, presumably in charge of the Stewart household: later at 19 Charlotte Square in Edinburgh.
Her mother Lady Grainger Stewart died on 10 June 1921, at Glendee Cottage, West Cults, which was the home of her daughter Agnes Grainger Stewart.
At this time, Agnes Grainger Stewart is noted as being the Lady Warden of Aberdeen Training Centre for Teachers.