The year 1668 in science and technology included many events, some of which are listed here.

See also: 1667 in science, other events of 1668, 1669 in science and the list of years in science.

Astronomy

• Isaac Newton invents the reflecting telescope

Biology

• Francesco Redi disproves theories of the spontaneous generation of maggots in putrefying matter.

Mathematics

• Nicholas Mercator and William Brouncker discover an infinite series for the logarithm while attempting to calculate the area under a hyperbolic segment

Births

• Hermann Boerhaave, Dutch physician and chemist who made Leiden a European centre of medical knowledge (died 1738)

Deaths