Sigma Tau Delta (ΣΤΔ) is a US-based, international honor society for students of English at four-year colleges and universities who are within the top 30% of their class and have a 3.5 GPA or higher.

The Society offers its members tens of thousands of dollars in scholarships, internships, grants, and awards, as well as publication opportunities in its journals The Rectangle and The Sigma Tau Delta Review.

Annually the Society provides an international convention, where over 1,000 students and faculty participate in scholarly and creative paper presentations, workshops, and roundtables, and hear featured speakers such as Ursula K. Le Guin, Neil Gaiman, and Poets Laureate Kay Ryan and Natasha Trethewey.

Sigma Tau Delta also sponsors the National English Honor Society (NEHS), currently with over 600 chapters, which serves students and faculty in high schools throughout the U.S. and abroad.

[2] At this first convention the first twelve chapters were installed, the insignia and regalia was formally adopted, and the society's publication, The Rectangle was established.

They must also have a minimum of a B or equivalent grade point average in English and must rank at least in the highest 35 percent of their class in general scholarship.

[6] The Society organizes a convention every year in March, at which members present original fiction, poetry, critical essays, and personal non-fiction.

Attendees also hear keynote presentations and readings and attend workshops, Q&A sessions, and book signings by featured speakers such as Ursula K. Le Guin, Neil Gaiman, and Poets Laureate Kay Ryan and Natasha Trethewey.

NEHS works with over 80,000 students worldwide each year, making it one of the largest secondary school honor societies in the world.