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 (36 C)
• 20th-century psychologists by nationality‎ (7 C)

A

• 20th-century Albanian scientists‎ (1 C, 13 P)
• 20th-century Algerian scientists‎ (1 C)
• 20th-century American scientists‎ (14 C, 643 P)
• 20th-century Argentine scientists‎ (8 C, 17 P)
• 20th-century Australian scientists‎ (10 C, 59 P)
• 20th-century Austrian scientists‎ (11 C, 29 P)
• 20th-century Azerbaijani scientists‎ (2 C, 2 P)

B

• 20th-century Belgian scientists‎ (7 C, 25 P)
• 20th-century Brazilian scientists‎ (9 C, 25 P)
• 20th-century British scientists‎ (14 C, 116 P)
• 20th-century Bulgarian scientists‎ (5 C, 19 P)

C

• 20th-century Canadian scientists‎ (11 C, 117 P)
• 20th-century Chilean scientists‎ (5 C, 1 P)
• 20th-century Chinese scientists‎ (10 C, 66 P)
• 20th-century Colombian scientists‎ (4 C)
• 20th-century Croatian scientists‎ (1 C, 10 P)
• Czechoslovak scientists‎ (10 C, 12 P)

D

• 20th-century Danish scientists‎ (10 C, 12 P)
• 20th-century Dutch scientists‎ (13 C, 55 P)

E

• East German scientists‎ (2 C, 39 P)
• 20th-century Estonian scientists‎ (4 C, 16 P)

F

• 20th-century Fijian scientists‎ (1 C, 14 P)
• 20th-century Filipino scientists‎ (4 C, 11 P)
• 20th-century Finnish scientists‎ (5 C, 8 P)
• 20th-century French scientists‎ (13 C, 55 P)

G

• 20th-century scientists from Georgia (country)‎ (2 C, 11 P)
• 20th-century German scientists‎ (13 C, 46 P)
• 20th-century Ghanaian scientists‎ (3 C, 19 P)
• 20th-century Greek scientists‎ (7 C, 18 P)

H

• 20th-century Hungarian scientists‎ (8 C, 3 P)

I

• 20th-century Icelandic scientists‎ (1 C, 9 P)
• 20th-century Indian scientists‎ (11 C, 63 P)
• 20th-century Indonesian scientists‎ (3 C, 5 P)
• 20th-century Iranian scientists‎ (4 C, 19 P)
• 20th-century Irish scientists‎ (10 C, 19 P)
• 20th-century Israeli scientists‎ (7 C, 12 P)
• 20th-century Italian scientists‎ (11 C, 40 P)

J

• 20th-century Japanese scientists‎ (8 C, 16 P)

K

• 20th-century Kenyan scientists‎ (2 C, 4 P)
• 20th-century Korean scientists‎ (4 C, 3 P)

L

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

M

• 20th-century Mexican scientists‎ (6 C, 28 P)

N

• 20th-century New Zealand scientists‎ (10 C, 66 P)
• 20th-century North Korean scientists‎ (8 P)
• 20th-century Norwegian scientists‎ (7 C, 27 P)

P

• 20th-century Pakistani scientists‎ (2 C, 6 P)
• 20th-century Peruvian scientists‎ (3 C, 8 P)
• 20th-century Polish scientists‎ (11 C, 40 P)
• 20th-century Portuguese scientists‎ (5 C, 10 P)

R

• Rhodesian scientists‎ (3 C, 2 P)
• 20th-century Russian scientists‎ (9 C, 48 P)

S

• 20th-century Saudi Arabian scientists‎ (3 C, 4 P)
• 20th-century South African scientists‎ (7 C, 10 P)
• 20th-century South Korean scientists‎ (3 C, 9 P)
• Soviet scientists‎ (27 C, 87 P)
• 20th-century Spanish scientists‎ (9 C, 24 P)
• 20th-century Swedish scientists‎ (10 C, 26 P)
• 20th-century Swiss scientists‎ (10 C, 20 P)
• 20th-century Syrian scientists‎ (3 C, 2 P)

T

• 20th-century Taiwanese scientists‎ (4 C, 42 P)
• 20th-century Tajikistani scientists‎ (8 P)
• 20th-century Thai scientists‎ (2 C, 2 P)
• 20th-century Turkish scientists‎ (4 C, 2 P)

U

• 20th-century Ugandan scientists‎ (2 C, 6 P)
• 20th-century Ukrainian scientists‎ (6 C, 16 P)

Y

• Yugoslav scientists‎ (13 C, 9 P)