Diet of Worms most commonly refers to the Diet of Worms of 1521 at which Martin Luther was outlawed as a heretic. It may also refer to:

Meetings of the Imperial Diet of the Holy Roman Empire in the city of Worms, Germany, including:

• Diet of Worms (1076), an ecclesiastical synod and diet at the beginning of the Investiture Controversy
• Diet of Worms (1122), a diet producing the Concordat of Worms, an agreement between the Catholic Church and the empire ending the Investiture Controversy
• Diet of Worms (1495), a diet at which comprehensive political reforms of the empire began
• Other diets convened at Worms in the years 829 [de], 895, 926, 1231 and 1545

• Diet of Worms (comedy group), an Irish comedy and theatre group based in Dublin and London
• "Diet of Worms", a song by This Heat from their self-titled album

• A colloquialism for helminthic therapy, an immunotherapy for inflammatory bowel diseases by means of parasitic worms

• Worms as food

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