Imperial Diet means the highest representative assembly in an empire, notably:

• the historic institution of the Reichstag, either the estates (ranking noble and clerical Princes and cities) in the Holy Roman Empire
• the parliament of the German Empire (Reichstag)
• the parliament of the Weimar Republic (Reichstag)
• the parliament of Nazi Germany
• Today, in the Federal Republic of Germany, the two chambers of parliament are called the Bundestag and the Bundesrat.
• the legislature in Japan from the promulgation of the Meiji Constitution in 1889 until the 1947 Constitution of Japan replaced the Imperial Diet with National Diet of Japan.

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