Margaret Caroline Llewelyn Davies (16 October 1861 – 28 May 1944) was a British social activist who served as general secretary of the Co-operative Women's Guild from 1889 until 1921. Her election has been described as a "turning point" in the organization's history, increasing its political activity and beginning an era of unprecedented growth and success. Catherine Webb considered Davies's retirement such a significant loss for the Guild that she began writing , a history of the Guild to that time.