Boris Borisovich Yegorov (Russian: Бори́с Бори́сович Его́ров, November 26, 1937 – September 12, 1994) was a Soviet physician and cosmonaut who became the first medical doctor to travel to space.

His expertise in space medicine made him an ideal candidate for the role, and he quickly proved himself as a skilled cosmonaut.

He also monitored the health of his fellow crew members and provided medical assistance when needed, demonstrating his skill as a physician.

After his successful spaceflight, Yegorov continued his work in space medicine and became a professor at the Moscow Medical Institute.

He was involved in the development of medical equipment for use in space and contributed significantly to the understanding of the effects of spaceflight on the human body.