Boris Isaac Korenblum (Russian: Борис Исаакович Коренблюм, 12 August 1923, Odessa, now Ukraine – 15 December 2011, Slingerlands, New York) was a Soviet-Israeli-American mathematician, specializing in mathematical analysis.

Once, refusing to beat a prisoner who was talking already, he quarrelled with the superior officer, and was punished by being sent to a penal battalion.

There, he served with, and made fast wartime friends with, some rough characters, many of whom were discharged from penal colonies "to wash with their blood the offences against the Motherland."

He later told his family that this experience, together with the inevitable maturing during a bloody war, made a man out of a soft city boy with a doting Jewish mother.

Coming home from the war, he passed all the exams for the undergraduate degree in mathematics in a few of months, and was admitted for graduate study at the Institute of Mathematics of the National Academy of Sciences of Ukraine where he received in 1947 his Candidate of Sciences degree (PhD) under the direction of Evgeny Yakovlevich Remez.