Kārlis Šteins (October 13, 1911 – April 4, 1983) was a Latvian and Soviet astronomer and populariser of this science.
In 1929 he started the studies in University of Latvia, the Faculty of Mathematics and Natural Science.
He became a member of the IAU in 1958, and of the Astronomy council of the USSR Academy of Science in 1967.
Karlis Steins enriched astronomy with his research in cosmogony, celestial mechanics, and problems of precise time.
He obtained his Ph.D. at Pulkovo Observatory in 1963 by defending his thesis on the evolution of comet orbits.