Smallest paper money
Who
Unknown
Where
Romania ()
When
1917
The smallest national note ever issued was the 10-bani note of the Ministry of Finance of Romania in 1917. It measured (printed area) 27.5 x 38 mm (1.08 x 1.49 in). This is roughly one tenth the size of a US$1 banknote.

Of German Notgeld, the smallest were the 1/3 pfg notes of Passau (1920-1), measuring 18 x 18.5 mm (0.7 x 0.72 in).