Koychubay (Russian: Койчубай; Kazakh: Қойшыбай) is a rural Kazakh settlement in the Sherbakulsky District, Omsk oblast, in Western Siberia, Russia. 54°43′08″N 72°43′03″E / 54.71889°N 72.71750°E
Formerly semi-nomadic and now settled, the village - or aul, as it is still called - has probably existed since the second half of the 19th century. According to local researchers, it was named after a local leader, Koyshibay. Both the structure and the precise location of the village underwent some changes during the Soviet collectivization period.
Its most internationally notable resident was the entrepreneur Isa Zhaksymbayev (Zhaksybayev), a horse trader and a mill owner, who, at the height of the Russian Civil War in 1918 and 1919, employed an escaped prisoner of war Josip Broz, later known as Tito. In his own recollections, Tito described his host and employer as a wealthy man and a prominent figure who exercised judicial authority among local Kazakhs, who, according to Broz, were still living in yurts at the time.
After the war, Isa and his son Zhunus would become victims of Stalinist repressions.
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