Otto Oscar Binder (/ˈbɪndər/; August 26, 1911 – October 13, 1974) was an American author of science fiction and non-fiction books and stories, and comic books. He is best known as the co-creator of Supergirl and for his many scripts for Captain Marvel Adventures and other stories involving the entire superhero Marvel Family. He was prolific in the comic book field and is credited with writing over 4,400 stories across a variety of publishers under his own name, as well as more than 160 stories under the pen-name Eando Binder.

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