Mitchison is a surname that may refer to various individuals, including notable figures in science and literature. One prominent person is Margaret Mitchison, a Scottish author known for her novels and contributions to historical fiction. She was also involved in social and political issues throughout her life. In the field of biology, Sir John Mitchison was a distinguished immunologist recognized for his research on the immune system. His work has significantly advanced the understanding of how the body defends itself against diseases, contributing to the broader field of medical science.