Category:20th-century scientists by nationality

• 20th-century astronomers by nationality (27 C)
• 20th-century chemists by nationality (22 C)
• 20th-century mathematicians by nationality (63 C)
• 20th-century physicists by nationality (37 C)
• 20th-century psychologists by nationality (10 C)
• 20th-century social scientists by nationality (12 C)

A

• 20th-century Albanian scientists (1 C, 13 P)
• 20th-century Algerian scientists (3 C)
• 20th-century American scientists (18 C, 614 P)
• 20th-century Argentine scientists (8 C, 6 P)
• 20th-century Australian scientists (11 C, 51 P)
• 20th-century Austrian scientists (10 C, 30 P)
• 20th-century Azerbaijani scientists (3 C, 3 P)

B

• 20th-century Belgian scientists (7 C, 19 P)
• 20th-century Brazilian scientists (9 C, 29 P)
• 20th-century British scientists (18 C, 95 P)
• 20th-century Bulgarian scientists (6 C, 19 P)

C

• 20th-century Canadian scientists (11 C, 116 P)
• 20th-century Chilean scientists (6 C, 1 P)
• 20th-century Chinese scientists (10 C, 71 P)
• 20th-century Colombian scientists (5 C)
• 20th-century Croatian scientists (2 C, 10 P)
• Czechoslovak scientists (12 C, 14 P)

D

• 20th-century Danish scientists (10 C, 9 P)
• 20th-century Dutch scientists (12 C, 55 P)

E

• East German scientists (2 C, 40 P)
• 20th-century Estonian scientists (5 C, 16 P)

F

• 20th-century Fijian scientists (1 C, 14 P)
• 20th-century Filipino scientists (6 C, 10 P)
• 20th-century Finnish scientists (6 C, 9 P)
• 20th-century French scientists (12 C, 58 P)

G

• 20th-century scientists from Georgia (country) (2 C, 12 P)
• 20th-century German scientists (14 C, 41 P)
• 20th-century Ghanaian scientists (3 C, 20 P)
• 20th-century Greek scientists (7 C, 19 P)

H

• 20th-century Hungarian scientists (9 C, 3 P)

I

• 20th-century Icelandic scientists (1 C, 9 P)
• 20th-century Indian scientists (11 C, 65 P)
• 20th-century Indonesian scientists (4 C, 5 P)
• 20th-century Iranian scientists (6 C, 15 P)
• 20th-century Irish scientists (13 C, 17 P)
• 20th-century Israeli scientists (8 C, 15 P)
• 20th-century Italian scientists (11 C, 27 P)

J

• 20th-century Japanese scientists (9 C, 8 P)

K

• 20th-century Kenyan scientists (3 C, 6 P)
• 20th-century Korean scientists (4 C, 3 P)

L

• 20th-century Lithuanian scientists (2 C, 2 P)

M

• 20th-century Mexican scientists (7 C, 28 P)

N

• 20th-century New Zealand scientists (11 C, 49 P)
• 20th-century North Korean scientists (8 P)
• 20th-century Norwegian scientists (9 C, 32 P)

O

• 20th-century scientists from the Ottoman Empire (3 C, 5 P)

P

• 20th-century Pakistani scientists (4 C, 6 P)
• 20th-century Peruvian scientists (3 C, 8 P)
• 20th-century Polish scientists (12 C, 43 P)
• 20th-century Portuguese scientists (6 C, 10 P)

R

• Rhodesian scientists (2 C, 2 P)
• 20th-century Russian scientists (11 C, 44 P)

S

• 20th-century Saudi Arabian scientists (3 C, 4 P)
• 20th-century South African scientists (8 C, 15 P)
• 20th-century South Korean scientists (4 C, 9 P)
• Soviet scientists (21 C, 92 P)
• 20th-century Spanish scientists (11 C, 25 P)
• 20th-century Swedish scientists (12 C, 28 P)
• 20th-century Swiss scientists (10 C, 11 P)
• 20th-century Syrian scientists (4 C, 2 P)

T

• 20th-century Taiwanese scientists (5 C, 42 P)
• 20th-century Tajikistani scientists (8 P)
• 20th-century Thai scientists (3 C, 3 P)
• 20th-century Turkish scientists (5 C, 10 P)

U

• 20th-century Ugandan scientists (2 C, 7 P)
• 20th-century Ukrainian scientists (7 C, 16 P)

Y

• Yugoslav scientists (12 C, 9 P)