Vladimir Sergeyevich Antoshin (Владимир Сергеевич Антошин; 14 May 1929 in Moscow - 13 May 1994) was a Soviet chess Grandmaster, a theoretician and a national champion of correspondence chess.
As a young man, he was a high achiever, principally as part of the USSR's highly successful Student Olympiad team of 1954-56. The team won the silver medal at the first ever Student Olympiad in Oslo 1954 and then took gold medals at Lyons 1955 and at Uppsala 1956. His best performance probably occurred at Lyons, as the strength of the competition was far greater than at Oslo. Playing below world-class grandmasters Mark Taimanov and Boris Spassky, but above Alexey Suetin, his endeavors also earned him an individual gold medal for best score on board three. In all, he accumulated three gold and one silver medal, for a total score of 16/19.
During this period of his career, FIDE awarded him the International Master title (1963) and the Grandmaster title (1964).
Making a limited number of international tournament appearances, he was successful at Ulan Bator (1965) and Zinnowitz (1966). The latter was probably his finest moment, scoring +8, =6, -1, to take first place among reasonably strong opposition, including Victor Ciocaltea and Wolfgang Uhlmann.
Aside from Zinnowitz, Hartston notes that Antoshin's over-the-board results were never outstanding. His other results were nevertheless respectable; 2nd at Kienbaum (Berlin) 1959 (Uhlmann won), 5th at Moscow 1960 (ahead of Polugaevsky, Hort and Uhlmann), 4th at Sochi 1963, 4th at Moscow 1963 (ahead of Keres, Liberzon, Szabó and Hort), 6th= at Sochi 1964, 2nd at Venice 1966 (Ivkov won) and 4th at Havana 1968 (The Capablanca Memorial). He regularly played at Sochi, but finished lower on other occasions.