Gwyneth Marjorie Bebb (27 October 1889 - 9 October 1921) (later Mrs Thomson) was an English lawyer.
She was the plaintiff in Bebb v.
The Law Society, a test case in the opening of the legal profession to women in Britain.
She was expected to be the first woman to be called to the bar in England; in the event, her early death prevented that, and Ivy Williams was the first woman to qualify as a barrister in England, in May 1922.