Mary Tamm was a British actress, who appeared in many British TV drama series and serials, and is best known for her role as Romana I in the BBC's science fiction television series Doctor Who, appearing opposite Tom Baker in the 1978–1979 story arc The Key to Time.

Romana, short for Romanadvoratrelundar, is a fictional character in the long-running British science fiction television series Doctor Who. A Time Lord from the planet Gallifrey, she is a companion to the Fourth Doctor.