(Elinor) Catherine Hamlin (née Hinkelson), AC, MBBS, FRCS, FRANZCOG, FRCOG is an Australian obstetrician and gynaecologist who, with her husband New Zealander Dr. Reg Hamlin, co-founded the Addis Ababa Fistula Hospital, the world's only medical centre dedicated exclusively to providing free obstetric fistula repair surgery to poor women suffering from childbirth injuries.