The year 1644 in science and technology included many events, some of which are listed here.

See also: 1643 in science, other events of 1644, 1645 in science and the list of years in science.

Events

• The Basel problem is posed by Pietro Mengoli , and would puzzle mathematicians until solved by Leonhard Euler in 1735.

Births

• September 25 - Ole Rømer, Danish astronomer who made the first quantitative measurements of the speed of light.

Deaths