The Secret Lives of Waldo Kitty (later called The New Adventures of Waldo Kitty) is an American animated and partially live-action television series, produced by Filmation, which originally aired for one season on Saturday mornings on NBC from September 6 to November 29, 1975. Howard Morris, Jane Webb, and Allan Melvin provided voices for the three main characters on the series. The show follows a cat named Waldo who daydreams of being a superhero and defeating the villainous bulldog Tyrone. It was inspired by James Thurber's 1939 short story "The Secret Life of Walter Mitty", and his widow Helen Thurber sued Filmation in 1975 for creating the series without the permission of her husband's estate. The outcome of the decision resulted in the series being retitled in future broadcasts as The New Adventures of Waldo Kitty.

The Secret Lives of Waldo Kitty was produced by Lou Scheimer and Norm Prescott and directed by Don Christensen and Rudy Larriva. Critically, a positive response was aimed at the show's imaginative story lines and its ability to parody pop culture events well. However, producer Scheimer was upset by the series' final result, listing the issues that arose during production and the minimal number of episodes produced as reasons for this, among others. The series has a total of just 13 episodes. In 1989, three episodes from The Secret Lives of Waldo Kitty were featured on a VHS tape released by United American Video.