Oh Jang-seop (; 26 March 1947 – 17 July 2026) was a South Korean politician. A member of the New Korea Party and the United Liberal Democrats, he served in the National Assembly from 1992 to 1996 and from 1997 to 2004. He was also Minister of Construction and Transport from March to August 2001.

Oh died on 17 July 2026, at the age of 79.

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