Sergei Postrekhin (born November 1, 1957, in Kherson, Ukrainian SSR) is a Soviet-born Ukrainian sprint canoer who competed in the late 1970s and early 1980s.

Postrekhin also won three medals at the ICF Canoe Sprint World Championships with a gold (C-1 500 m: 1979) and two bronzes (C-1 500 m: 1982, C-2 1000 m: 1978).

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