Efim Bogoljubov (1889 - 1952) was a leading Ukrainian chess master. He emigrated to Germany after the World War I.
He played matches for the World Chess Championship twice, both times against Alexander Alekhine. In the first in 1929 he lost 15.5-9.5, in the second in 1934 he lost 15.5.-10.5.
The Bogo-Indian chess opening (1.d4 Nf6 2.c4 e6 3.Nf3 Bb4+ in algebraic notation) is named after Bogoljubov.
