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| 1921 |
| | | Alfred Adler, in Vienna, opens the first of many child-guidance clinics | |
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| 1922 |
| | | Canadian physiologists Frederick Banting and Charles Best isolate insulin from the pancreas for the treatment of diabetes | |
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| 1923 |
| | | Sigmund Freud proposes a new interpretation of the mind in his book The Ego and the Id | |
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| 1928 |
| | | English psychologist Henry Havelock Ellis completes a thirty-year project, his 7-volume Studies in the Psychology of Sex | |
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| 1928 |
| | | An Aerial Medical Service is launched in Queensland, Australia, subsequently becoming the Flying Doctor Service | |
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| 1928 |
| | | Scottish bacteriologist Alexander Fleming accidentally discovers a mould that selectively kills bacteria, and calls it penicillin | |
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| 1932 |
| | | A deeply flawed experiment with African American syphilis patients is launched in Tuskegee, Alabama | |
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| 1937 |
| | | British biochemist Max Perutz begins the analysis of haemoglobin | |
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| 1938 |
| | | Lord Nuffield donates to Commonwealth hospitals 'iron lungs', built at his Morris Oxford factory, | |
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| 1940 |
| | | British biologists Ernst Chain and Howard Florey develop penicillin as a safe and useful antibacterial drug | |
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