The year 1620 in science and technology included many events, some of which are listed here.

See also: 1619 in science, other events of 1620, 1621 in science and the list of years in science.

Chemistry

• The scientific method of reasoning is expounded by Francis Bacon in his Novum Organum

Geology

• Francis Bacon notices the jigsaw fit of the opposite shores of the Atlantic Ocean

Births

• Jean Picard, French astronomer (died 1682)
• Robert Morison, Scottish botanist (died 1683)
• Edme Mariotte, French physicist (died 1684)

Deaths

• Simon Stevin, Flemish scientist (born c1548)