Gwyneth Strong is an English actress. She is best known for her role in the BBC sitcom Only Fools and Horses as Cassandra, the love interest and, later, wife of Rodney (Nicholas Lyndhurst).

Strong's first acting appearance was in the Royal Court Theatre's production Live Like Pigs, when she was eleven. In 1973, whilst a pupil at Holland Park School, she appeared in the horror film Nothing But the Night as Mary Valley, and she was a regular in the children's TV series The Flockton Flyer between 1977 and 1979, as Jan Carter.