Sergei Konstantinovich Krikalev (Сергей Константинович Крикалёв, born August 27, 1958) is a Russian cosmonaut and veteran of six space flights. He has been dubbed by many “the last Soviet Citizen” as in 1991–1992 he spent 311 days, 20 hours and 1 minute aboard the Mir space station whilst back on Earth the Soviet Union collapsed.
Krikalev was born in Leningrad (now St. Petersburg), Russia. He is married to Yelena Yuryevna Terekhina and has one daughter, Olga Sergeevna Krikaleva, born in 1990. Sergei enjoys swimming, skiing, cycling, aerobatic flying, and amateur radio operations, particularly from space (callsigns U5MIR and X75M1K).
He overtook Sergei Avdeyev's previous record for the career total time spent in space (747.59 days) during Expedition 11 to the International Space Station. Krikalev has logged a total 803 days and 9 hours and 39 minutes in space.