National Union of Coal Mine Workers

{{short description|Trade union in Japan}}

The National Union of Coal Mine Workers (Zentanko) was a trade union representing coal miners in Japan.

The union was founded in 1952, with the merger of a union which had split from the Japan Coal Miners' Union in 1949 with another dissident faction of that union.{{cite book |last1=Hein |first1=Laura Elizabeth |title=Fueling Growth: The Energy Revolution and Economic Policy in Postwar Japan |date=1990 |publisher=Council of East Asian Studies |location=Harvard |isbn=9780674326804}} It was a founding affiliate of the Japanese Confederation of Labour, and by 1967, it had 31,799 members.{{cite book |last1=Chaffee |first1=Frederick H. |title=Area Handbook for Japan |date=1969 |publisher=U.S. Government Printing Office |location=Washington DC}} It transferred to the Japanese Trade Union Confederation at the end of the 1980s, but lost members as the industry declined, and by 1996 was down to 1,750 members.{{cite web |title=List of RENGO affiliated union members |url=http://www.crosscurrents.hawaii.edu/assets/jwork/extra/doc/JWORK089_377.pdf |website=Cross Currents |access-date=18 November 2021}}