Elinor Catherine Hamlin, AC, FRCS, FRANZCOG, FRCOG (née Nicholson; 24 January 1924 - 18 March 2020) was an Australian obstetrician and gynaecologist who, together with her husband, New Zealander Reginald Hamlin, co-based the Addis Ababa Fistula Hospital, the world's solely medical centre dedicated.