Vicki is a fictional character played by Maureen O'Brien in the long-running British science fiction television series Doctor Who. An orphan from the 25th century, she was a companion of the First Doctor and a regular in the programme in Seasons 2 and 3 in 1965. Her last name was never revealed during the series. Vicki appeared in 9 stories.

Maureen O'Brien is an English actress and author best known for playing the role of Vicki in the BBC science fiction television series Doctor Who, although she has appeared in many other television programmes.