The one-hundred-quintillion-pengő banknote is one of the highest-denomination banknotes ever circulated, issued in 1946 during Hungary's extreme post-WWII hyperinflation, a period of unprecedented economic chaos where the currency lost value incredibly fast (see or ). This massive note, sometimes called the one hundred million b.-pengő (), was part of a series symbolizing the peak of this inflation, though an even higher, unissued sextillion pengő note was also printed. The exchange rate of the one-hundred-quintillion-pengő note at the time was approximately $0.20 United States dollars.
See also Zimbabwean one hundred trillion dollar note
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