Oh Se-hoon

First mayoralty (2006–2011)

On 1 July 2006, Oh began his first term as the Mayor of Seoul. Oh was re-elected to his second term in 2010 but resigned in 2011, partly due to the rejection of his proposal under the Seoul free lunch referendum.^[5]

During his tenure, Oh was involved with the Seoul Foundation for Arts and Culture, participating in a celebration video for the organization alongside foundation chairman Park Bum-shin and Seoul Arts Director Ahn Eun-mi.^[6] Dongdaemun Design Plaza was also constructed during his tenure.^[7]

Post first mayoralty

In 2012, Oh spent time in London, United Kingdom as a fellow in the Faculty of Social Science & Public Policy at King's College London, focusing on major cities around the world and seeking ways to create jobs and help promote economic growth.^[12]

Oh attempted to return to elected office in the 2016 South Korean legislative election, but his campaign was unsuccessful.^[13] In the 2020 legislative election, he ran in the Gwangjin District but was defeated by political newcomer Ko Min-jung.^[14][15]

Despite his electoral defeats, Oh remained a potential contender for the 2022 South Korean presidential election. In July 2020, he unveiled a series of housing and welfare policy proposals, including a "real estate trifecta" comprising a price cap on new apartments, the disclosure of construction costs, and a post-construction sales system. He also called for the large-scale supply of "half-price apartments" in Seoul and the easing of regulations on reconstruction and redevelopment.^[16]

Second mayoralty (2021–present)

In 2021, Oh won the People Power Party primary to become the party candidate for the Seoul mayoral by-election. He later won the election, defeating Democratic Party nominee Park Young-sun with 57.5 percent of the vote.^[17]

Oh began his third term on 8 April 2021. During the 2022 South Korean local elections, Oh secured his fourth term.^[18] In September 2023, Oh met with the mayor of New York City, Eric Adams in Manhattan, to deepen the cultural and economic ties between Seoul and New York City.^[19] This was his first official trip representing Seoul on the sidelines of the United Nations General Assembly meeting.

During the 2026 South Korean local elections, Oh ran for a fifth term as Mayor of Seoul. His campaign focused on checking the power of the ruling Democratic Party, which controlled both the presidency and a large portion of the National Assembly. Oh campaigned on the slogan of keeping Seoul the "last bastion" of political balance.^[20] To appeal to moderate voters, Oh also distanced himself from the People Power Party leadership. He publicly demanded that the PPP sever ties with former President Yoon Suk Yeol following Yoon's failed martial law declaration.^[13] While this created friction with party leadership, PPP Leader Jang Dong-hyeok ultimately issued an apology and Oh ran on the conservative ticket.^[21]

On 4 June 2026, Oh secured a historic fifth mayoral term in a highly competitive race during the 2026 South Korean local elections, narrowly defeating Democratic Party challenger Chong Won-o.^[22] Though an exit poll released jointly by major broadcasters KBS, MBC, and SBS put Chong ahead, Oh overcame a prolonged early lead during the final hours of ballot counting to pull ahead.^[23]

In his victory speech, Oh stated, "I express my deep respect and gratitude to the citizens who have preserved the balance of democracy in the name of Seoul."^[24]

LGBTQ rights

Oh stated he "personally can't agree with homosexuality".^[25]

When asked about the Seoul Queer Culture Festival during the 2021 Seoul mayoral race, Oh has stated: "In a broader spectrum, the principle is that the rights of minorities, including sexual minorities, must be protected and there should be no discrimination. I of course agree that discrimination must be prohibited. But I think the debate was on the queer festival being held in the central area near City Hall and Gwanghwamun Square, and the city of Seoul has a special committee to make a decision, and there are rules to that as well. This is an issue to be decided with usage rules of the City Hall square, and this is not something that a mayor can individually decide."^[26][27]

Oh in 2022 said Seoul may prohibit the Seoul Queer Parade from using the city hall plaza if participants "exhibit indecent materials or overexpose their bodies."^[28]

In 2024, the Seoul Queer Parade was denied permission to gather at Seoul Plaza. Municipal authorities cited a book related festival as reason for the denial.^[25]

Nuclear weapons

Oh supports South Korea acquiring nuclear weapons in order to counter North Korea. In March 2023, during an interview with Reuters, he said that "we've come to a point where it is difficult to convince people with the logic that we should refrain from developing nuclear weapons and stick to the cause of denuclearisation".^[29][30]

Diplomatic cable

In a leaked diplomatic cable, it was reported that in Oh's discussion with Alexander Vershbow in 2006 he stated that a merger between the Grand National Party and the Democratic Party would be beneficial to the GNP.^[31]

Relations with President Yoon Suk Yeol

Despite being a member of the People Power Party of President Yoon Suk Yeol, Oh opposed Yoon's declaration of martial law on 3 December 2024.^[32]