Guy Ilyich Severin (Russian: Гай Ильи́ч Севери́н, Gay Ilyich Severin; July 24, 1926 – February 7, 2008) was a Soviet and Russian scientist, engineer, academician of the Russian Academy of Sciences, doctor of technical science, professor, full member of the International Academy of Astronautics, inventor and producer of a number of aerospace life-rescue systems and space suits.

He participated in preparations for Yuri Gagarin's and other Soviet cosmonauts space flights on Vostok, Voskhod and Soyuz spacecraft.

The civil funeral was held at the House of Culture Zvezdniy in Tomilino on February 11, 2008.

Present among the attendees was Boris Chertok, last remaining colleague of Sergei Korolev.

On July 24, 2008 a memorial to Severin was opened on the territory of the NPP Zvezda in Tomilino - a bronze bust.