Peggy Aitchison (1921-1990) was a British actress who played the prison guard in The Great Muppet Caper.
Aitchison was a familiar face on British television from around 1963 onward, as assorted landladies, neighbors, and cooks. She performed in one-shot adaptations from George Orwell, Charlotte Bronte, Henry James, and Henrik Ibsen. On the soap opera Crossroads, she played the grousing Mrs. Blundell from the first episode in 1964 through 1970. She was a regular on the sitcoms Robin's Nest (1978-1981, as Gertrude) and Ffizz (1987-1989, with Richard Griffiths).