Miss Canfield is a fictional character in the American television sitcom Leave It to Beaver. Miss Canfield is portrayed by Diane Brewster.The character appeared in four first season episodes. Brewster then left the series without explanation. Sue Randall stepped in to play Beaver's teacher, Alice Landers, over the following seasons.Miss Canfield's portrayer Diane Brewster also appeared in the show's pilot "It's a Small World" as Miss Simms, a secretary at the Franklin Milk Company.