Louise Tate

 is Larry Tate's wife and Samantha Stephens' best mortal friend.

Trivia
Louise is portrayed by Irene Vernon in thirteen episodes over the show's first two seasons (1964-1966). After Vernon's departure, Kasey Rogers played the part of Louise in thirty-three episodes for the remainder of the series (1966-1972).

Note:
 * 1) In, which takes place in 1967, it is stated ten years have elapsed since Larry and Louise's first honeymoon, which may lead some to assume they were married sometime around 1957. However, in Season One, episode twelve  (which takes place in 1964), Louise states that she is finally pregnant after sixteen years, so it is possible their first honeymoon took place some years after they were married.