Jae Weong Seo (Hangul: 서재응; Hanja: 徐在應; Korean pronunciation: [sʌ.dʑɛ̝.ɯŋ]; born May 24, 1977 in Gwangju, South Korea), usually referred to as simply Jae Seo and pronounced "Jay So", is a retired Korean professional baseball player. Originally signed by the New York Mets of Major League Baseball, Seo went on to play in the KBO League for the Kia Tigers.

Seo attended Inha University in Incheon, South Korea where he led his team to the Korean collegiate championship in 1997.

In 1998, Seo was signed as a free agent by the New York Mets. After an excellent first year of professional play, Seo underwent reconstructive surgery on his elbow in 1999. He did not pitch again until 2001. On July 21, 2002, Seo made his major league debut with a scoreless inning of relief against the Cincinnati Reds. In 2003, Seo spent the entire season with the Mets as a starting pitcher. He logged 188 innings pitched and 31 games started, both tops among rookie pitchers in the National League that year. In 2004, Seo struggled, splitting his time between the Mets and the Triple-A Norfolk Tides.

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