Sigma Tau Delta, the International English Honor Society, was founded in May 1924 at Dakota Wesleyan College in Mitchell, South Dakota, by Professor Judson Q. Owen. Its central purpose is to confer distinction upon outstanding students of the English language and literature in undergraduate, graduate, and professional studies. Sigma Tau Delta also recognizes the accomplishments of professional writers who have contributed to the fields of language and literature.

The name Sigma Tau Delta comes from the Greek letters representing the first letter of each of the words that form the official motto, Sincerity, Truth, Design.