The Japan Federation of National Public Service Employees' Unions (, Kokko Roren) is a trade union representing public sector workers in Japan.

The union was established on 1 October 1975, to bring together the various public sector unions affiliated with the General Council of Trade Unions of Japan (Sohyo). On formation, it had 87,112 members:

Union Abbreviation Membership (1980) All International Trade and Industry Ministry Workers' Union Zenshoko 9,801 All Judiciary Administration Employees' Union Zenshiho 14,848 All Radio Wave Control Agency Workers' Union Zendenpa 2,127 All Transportation Workers' Union Zenunyu ? All Weather Bureau Workers' Union Zenkisho 4,603 Construction Ministry Workers' Union Zenkenro 6,541 Education Ministry Employees' Union Monbushokuso 1,120 Federation of Unions of the Office of Prime Minister Sorifuroren 1,586 Japan Customs Employees' Union Zenzeikan 744 Justice Ministry Employees' Union Zenhomu 10,298 Labor Ministry Workers' Union Zenrodo 19,769 National Tax Collectors' Union Zenkokuzei 1,800 Union of Employees of the Harbour Construction Board Zenkoken 2,857 Welfare Ministry Employees' Union Zenkosei 3,413 Zengyokan 886

Membership grew to 138,503 by 1989. That year, Sohyo merged into the Japanese Trade Union Confederation (RENGO). Kokko Roren decided instead to become a founding affiliate of the National Confederation of Trade Unions, although a section which wished to join RENGO split away and formed the Japan Central Federation of National Public Service Employees' Unions. By 2019, the union's membership had fallen to 60,454.

The union's largest affiliates include:

All Economy, Trade and Industry Labor Union All Health and Welfare Ministry Workers' Union All Japan National Hospital Workers' Union All Judiciary Administration Employees' Union Labour Ministry Workers' Union Labour Union of MLIT, JMA and Affiliates Justice Ministry Employees' Union National Tax Collectors' Union

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