Susan Westerby, also known professionally as Suzy Westerby or Sue Westerby, is a British actress whose career has spanned from the 1950s into the 21st century, with a significant body of work in voice-over roles. Her early career was rooted in on-screen and radio performances in the United Kingdom during the 1950s, where she appeared in television series such as The Adventures of Robin Hood and in various stage and radio productions. During this period, she was often cast in supporting roles, including parts in serials like Sara Crewe and The Eustace Diamonds.

From the 1980s onward, Westerby became primarily known for her voice work, contributing to a range of projects in film, television, and video games. She provided character voices for the children's animated series The Telebugs in 1986. Her film credits include voicing some of the Podlings in the 1982 fantasy film The Dark Crystal. In the realm of anime, she is credited with the role of Sawa in the 1991 anime series Mermaid Forest (Ningyo no Mori), appearing under the name Susie Westerby.

Her later work demonstrates a continued presence in voice acting, with credits including a guest voice in the 2005 animated series Captain Scarlet. In 2006, she provided the voice of Old Morna for the film Minotaur. Her career also extended into video games, where she voiced a character in the 2009 episodic game Wallace and Gromit's Grand Adventures. Throughout her decades-long career, Westerby has demonstrated versatility across different media, moving from on-screen appearances to a focus on character and voice work in both British and international productions.