Sue Belinda Giblin (born 2 March 1950) professionally billed as Belinda Giblin, is an Australian actress. Prominent in theatre and television soap operas, Giblin's small screen roles include The Box as Kay Webster (1974-1975), The Sullivans (1977–1978) as Sister Sue Marriott, Sons and Daughters (1985-1987), as Alison Carr and her two stints in Home and Away, firstly as Cynthia Ross in 1991, and then Martha Stewart, the long-presumed dead wife of Alf Stewart, a role she played on a recurring basis from 2018 to 2022.