The Cloth Hat, Cap and Millinery Workers International Union (CHCMW) was a trade union representing workers involved in making headwear in the United States and Canada.
The union was founded in 1901 in New York City as the United Cloth Hat and Cap Makers of North America.
It had an ongoing dispute with the rival United Hatters of North America over which union should organise straw hat makers and millinery workers.
In 1917, the AFL decided that these workers should join the Hatters, which led the CHCMW to withdraw, and it was officially suspended from membership in 1918.
In 1923, the United Hatters agreed to withdraw from representing milliners, and so the CHCMW was reinstated to the AFL in 1924, the following year adopting its final name.