| Linking Name: | the Trilateral Cooperation Secretariat |
| Image Symbol: | Logo of TCS.png |
| Symbol Type: | Logo of TCS |
| Map Width: | 220px |
| Admin Center Type: | Headquarters |
| Coordinates: | 37.5698°N 126.9739°W |
| Membership: | |
| Leader Title1: | Secretary-General |
| Leader Name1: |  Lee Hee-sup |
| Leader Title2: | Deputy Secretaries-General |
| Established Event1: | Established |
The Trilateral Cooperation Secretariat (TCS) is an international organization established with a vision to promote "Lasting Peace, Common Prosperity, and Shared Culture" among China, Japan, and South Korea.[1] Upon the agreement signed and ratified by each of the three governments, the TCS was officially inaugurated in Seoul, on 1 September 2011.[2] On the basis of equal participation, each government shares 1/3 of the total operational budget.
The idea of a trilateral framework between China, Japan and the Republic of Korea has its roots in the breakfasts attended by the three leaders at the sidelines of the 1999 ASEAN+3 Summit in Manila.[3] This meeting marked the first step for developing trilateral cooperation and its framework, with 1999 being celebrated as the first year of China-Japan-South Korea cooperation.[4]
The three countries continued to hold annual meetings at the ASEAN+3 Summit. After several years of negotiations, the three countries agreed at the 2007 ASEAN+3 Summit to hold separate stand-alone meetings in the future. Hence, in 2008, what began as a side-conference to the ASEAN meetings officially developed into the first China-Japan-South Korea Trilateral Summit, held in Fukuoka, Japan.[5]
Discussions of a stand-alone secretariat began in 2009 at the 2nd Trilateral Summit held in Beijing, China. This was officially agreed upon by the three countries in May 2010 at the 3rd Trilateral Summit held in Jeju, Republic of Korea, where the three leaders signed the Memorandum. Later in December 2010, the three governments signed the Agreement on the Establishment of the Trilateral Cooperation Secretariat,[6] and the Trilateral Cooperation Secretariat was finally established in Seoul, Republic of Korea in September 2011.[7]
The TCS consists of a Consultative Board and four departments.[8]
The Consultative Board, the executive decision-making body of the organization, is composed of a secretary-general (SG) and two deputy secretaries-general (DSG). The secretary-general is appointed on a two-year rotational basis in the order of South Korea, Japan, and China. The other two countries nominate a deputy secretary-general each.
| 1st Board Sep. 2011 - Aug. 2013 | SHIN Bong-kil | MATSUKAWA Rui  | MAO Ning | |
|---|---|---|---|---|
| 2nd Board Sep. 2013 - Aug. 2015 | IWATANI Shigeo | CHEN Feng | LEE Jong-heon | |
| 3rd Board Sep. 2015 - Aug. 2017 | YANG Houlan | LEE Jong-heon | UMEZAWA Akima | |
| 4th Board Sep. 2017 - Aug. 2019 | LEE Jong-heon | YAMAMOTO Yasushi | HAN Mei | |
| 5th Board Sep. 2019 - Aug. 2021 | MICHIGAMI Hisashi | CAO Jing | KANG Do-ho | |
| 6th Board Sep. 2021–Present | OU Boqian | BEK Bum-hym | SAKATA Natsuko | |
| 7th Board Sep. 2023–Present | LEE He-sup | ZUSHI Shuji | YAN Liang |
Under the Consultative Board, there are four departments: Political Affairs, Economic Affairs, Socio-Cultural Affairs, and Management and Coordination. The four departments are composed of officials seconded by the three countries and general service staff recruited through open competition from the three countries.
Under the mission of promoting "Lasting Peace, Common Prosperity, and Shared Culture," the TCS aims to serve as a hub for the Trilateral Cooperation that encompasses a broad spectrum of sectors and actors.
Youth Exchange
Promoting trilateral cooperation / Cooperative projects
Research and Publications[10]