The year 1604 CE in science and technology consisted of many events, some of which are listed below.

See also: 1603 in science, other events of 1604, 1605 in science, and the list of years in science.

Astronomy

• Supernova 1604 is observed. As of 2003, this was the last supernova to be observed in the Milky Way.

Exploration

• Luis Vaez de Torres is the first European to sail through the Torres Strait.
• France begins settling French Guiana.
• Russian city of Tomsk founded, in Siberia.

Medicine

• Johannes Kepler describes how the eye focuses light.

Physics

• Kepler specifies the law of rectilinear propagation for light waves.

Births

Deaths