Interregnum could mean:
- Interregnum, a period between monarchs, between popes of the Roman Catholic Church, or between consuls of the Roman Republic
- Interregnum (solitaire), a solitaire card game
- Interregnum (documentary) a documentary with and about the drawings of George Grosz
- Interregnum (fiction), the period between the first and the second Galactic Empires, in the fictitious future world of Isaac Asimov's Foundation Series
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