The New Zealand Dairy Workers Union (NZDWU) is a national trade union in New Zealand.

It represents over 8,000 workers active in dairy factories, town milk supply, processing plants, stores and warehousing, packing, can-making, and other ancillary activities including drivers.

The NZDWU is affiliated with the New Zealand Council of Trade Unions, the IUF and the New Zealand Labour Party.

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