Caroline Frances John was an English actress. She played classical roles on the stage and also portrayed Elizabeth "Liz" Shaw in the BBC science fiction television series Doctor Who, as well as several other television roles.

Elizabeth "Liz" Shaw is a fictional character played by Caroline John in the long-running British science fiction television series Doctor Who and its spin-offs. A civilian member of UNIT, an international organisation that defends Earth from alien threats, she was the companion of the Third Doctor for the 1970 season. Liz appeared in 4 stories.