Seo Kyoung-Duk (; Hanja:徐坰德, born 25 May 1974) is a South Korean social activist. He is a counselor at the Presidential Council on Nation Branding, a professor in Sungshin University, and the creator of ‘Dokdo School’ (), an educational institution with a strong patriotic orientation. Professor Seo criticizes Japan on comfort women and Liancourt Rocks disputes and actively involves in Sino-Korean cultural disputes.
In 2021, he placed an ad in The New York Times, saying that "Korea's Kimchi, It's for Everyone.".
In 2025, called for a strong sentence against streamer Johnny Somali, who was on trial in South Korea to discourage others from engaging in similar behavior.
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