The year 1675 in science and technology included many events, some of which are included below.

See also: 1674 in science, other events of 1675, 1676 in science, list of years in science

Astronomy

• Giovanni Cassini discovers Saturn's Cassini Division
• John Flamsteed is appointed the first Astronomer Royal

Births

• February 28 - Guillaume Delisle, French scientist, one of the founders of modern geography (died 1726)

Deaths

• October 27 - Gilles de Roberval, French mathematician (born 1602)