A thirteenth is a note and an interval in music theory.

Thirteenth or 13th may also refer to:

• 13th (film), a 2016 documentary on the Thirteenth Amendment to the United States Constitution
• "The 13th", a song from Wild Mood Swings by The Cure
• "The Thirteenth" (Orange Is the New Black), a 2019 television episode
• Thirteenth, Italian fairy tale from Sicily

This disambiguation page lists articles associated with the title Thirteenth.
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