Tom Swift Jr. is the central character in a series of 33 science fiction adventure novels for male adolescents, following in the tradition of the earlier Tom Swift ("Senior") novels. The series was titled The New Tom Swift Jr. Adventures. Unlike the Nancy Drew and Hardy Boys titles that were also products of the prolific Stratemeyer Syndicate, the original Tom Swift stories were not rewritten in the 1950s to modernize them. It was decided that the protagonist of the new series would be the son of the earlier Tom Swift and his wife, Mary Nestor Swift; the original hero continued as a series regular, as did his pal Ned Newton. The covers were created by illustrator J. Graham Kaye. Covers in the later half of the series were mostly by Charles Brey. A total of 33 volumes were eventually published.

Tom Swift is the main character of six series of American juvenile science fiction and adventure novels that emphasize science, invention, and technology. Inaugurated in 1910, the sequence of series comprises more than 100 volumes. The first Tom Swift – later, Tom Swift Sr. – was created by Edward Stratemeyer, the founder of the Stratemeyer Syndicate, a book packaging firm. Tom's adventures have been written by various ghostwriters, beginning with Howard Garis. Most of the books are credited to the collective pseudonym "Victor Appleton". The 33 volumes of the second series use the pseudonym Victor Appleton II for the author. For this series, and some later ones, the main character is "Tom Swift Jr." New titles have been published again from 2019 after a gap of about ten years, roughly the time that has passed before every resumption. Most of the series emphasized Tom's inventions. The books generally describe the effects of science and technology as wholly beneficial, and the role of the inventor in society as admirable and heroic.