John McKenzie (1885 – 1958) was a Scottish trade unionist.
McKenzie joined the National Union of Gasworkers and General Labourers and from 1910, he worked full-time for the union as a district organiser.
In 1913, the union appointed him as its Scottish district secretary.
He opposed the Red Clydeside movement, claiming that it was a conspiracy of craft unions, and that many people wished to work, but were prevented from doing so by mass pickets.
[1] McKenzie retained the position when the union became part of the new National Union of General and Municipal Workers.