John Frith (6 July 1837 – 17 February 1904) was a British trade unionist.
In 1858, he was a founding member of the South Yorkshire Miners' Association (SYMA), forming a lodge in Rawmarsh.
In 1875, the union's leader, John Normansell, died, and Frith took over as secretary.
[1] When Frith became leader of the union, the price of coal was falling, leading to wage cuts.
The SYMA had invested in the Shirland Colliery Company, which collapsed in 1877, losing all the union's funds.