Janet Waldo (born Jeanette Marie Waldo; February 4, 1919 – June 12, 2016) was an American radio and voice actress. In animation, she voiced Judy Jetson in various Hanna-Barbera media, Nancy in Shazzan, Penelope Pitstop, Princess from Battle of the Planets, and Josie in Josie and the Pussycats. On radio, she was the title character in Meet Corliss Archer.

Waldo appeared in several films in uncredited bit parts and small roles, although she was the leading lady in three Westerns, two of them starring Tim Holt. Her big break came in radio with a part on Cecil B. DeMille's Lux Radio Theater. In her radio career, she lent her voice to many programs, including Edward G. Robinson's Big Town, The Eddie Bracken Show, Favorite Story, Four Star Playhouse, The Gallant Heart, One Man's Family, Sears Radio Theater, and Stars over Hollywood. She played several characters including Joanne Allen and Mrs. Hodges on the radio show Adventures in Odyssey, produced by Focus on the Family broadcasting.

She co-starred with Jimmy Lydon in the CBS situation comedy Young Love (1949–50), and she had recurring roles on The Adventures of Ozzie and Harriet (as teenager Emmy Lou), The Red Skelton Show, and People Are Funny. She recorded with jazz vocalist Mel Torme and his vocal group the Mel-Tones. Her eight-year run starring as teenager Corliss Archer on CBS's Meet Corliss Archer left a lasting impression, though Shirley Temple starred in the film adaptations, Kiss and Tell and A Kiss for Corliss. The radio program was the CBS answer to NBC's popular A Date with Judy. Despite the long run of Meet Corliss Archer, fewer than 24 episodes are known to exist. Waldo later turned down the offer to portray Corliss in a television adaptation (the role was recast with Ann Baker taking the role for TV).