Bagrat Ioannisiani

Bagrat Konstantinovich Ioannisiani (born 23 October 1911 in Yerevan, Armenia, died 10 December 1985 in Leningrad, Soviet Union) was a Soviet telescope designer of Armenian descent.

He was the chief designer of the BTA-6, one of the largest telescopes in the world. He was awarded the Lenin Prize in 1957.