Ruth, Lady Herbert Lewis, OBE (née Caine; 29 November 1871 – 26 August 1946) was an English temperance movement activist of Manx descent and collector of Welsh folk songs.

[2] She and other Society members collected wax cylinder recordings of Welsh-language traditional songs, and published a journal of their findings.

Ruth, Lady Herbert Lewis was active in the North Wales Women's Temperance Union.

[7] Other materials relating to Lady Herbert Lewis are at Bangor University,[8] the National Library of Wales and Flintshire Record Office.

[5] The National Eisteddfod has an annual "Lady Herbert Lewis Memorial Competition" for adult solo folk singers.