Norma MacMillan (September 15, 1921 – March 16, 2001) was a Canadian actress, best known for voicing numerous characters in animation and Claymation, including Casper the Friendly Ghost on The New Casper Cartoon Show, Gumby on The Gumby Show, Sweet Polly Purebred on Underdog, and Davey on Davey and Goliath.