Category:1820 in Europe

• 1820 crimes in Europe‎ (3 C)
• 1820 elections in Europe‎ (2 C, 4 P)

/

• 1820 disestablishments in Europe‎ (3 C)
• 1820 establishments in Europe‎ (10 C, 1 P)

D

• 1820 in Denmark‎ (1 C, 1 P)

E

• 1820 in England‎ (2 C, 3 P)

F

• 1820 in France‎ (4 C, 2 P)

G

• 1820 in Germany‎ (1 C, 1 P)
• 1820 in the Grand Duchy of Tuscany‎ (1 C)

I

• 1820 in Ireland‎ (1 C, 1 P)
• 1820 in Italy‎ (2 C)

L

• 1820 in Luxembourg‎ (1 P)

N

• 1820 in the Netherlands‎ (1 C, 1 P)
• 1820 in Norway‎ (2 P)

P

• 1820 in Poland‎ (1 C)
• 1820 in Portugal‎ (2 C, 3 P)

S

• 1820 in Scotland‎ (1 C, 8 P)
• 1820 in Spain‎ (3 C, 1 P)
• 1820 in Sweden‎ (1 C, 2 P)

T

• 1820 in the Austrian Empire‎ (1 P)

U

• 1820 in the United Kingdom‎ (11 C, 10 P)

W

• 1820 in Wales‎ (1 P)

0–9

• 1820 in the United Kingdom
• 1820 in Wales

F

• 1820 in France

G

• Gauss's Pythagorean right triangle proposal
• 1820 in Germany

I

• 1820 in Ireland

P

• 1820 in Portugal

S

• 1820 in Scotland