Diet of Frankfurt may refer any of the sessions of the Imperial Diet, Imperial States, or the prince-electors of the Holy Roman Empire which took place in the Imperial City of Frankfurt.

An incomplete lists of Diets of Frankfurt includes :

• Diet of Frankfurt (1147)
• Diet of Frankfurt (1196)
• Diet of Frankfurt (1338)
• Diet of Frankfurt (1379)
• Diet of Frankfurt (1439), attended by the Spanish diplomat Domingo Ram y Lanaja
• Diet of Frankfurt (1556), attended by François Hotman
• Diet of Frankfurt (1790), attended by the Italian Cardinal Bartolomeo Pacca

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