John Sime (died 1943) was a Scottish trade union leader.
In 1906, Sime was the founding president of the Dundee and District Union of Jute and Flax Workers.
[1][2] In 1923, Sime led a strike at the Camperdown Works; although the workers there remained solid in support of the action, workers elsewhere in the city did not undertake solidarity action, and after many weeks, the strike was lost.
[3] In 1925/26, Sime and local Member of Parliament Tom Johnston visited Calcutta to investigate working conditions there, and reportedly positively on the recently established Bengal Jute Mill Workers' Union.
[3] Sime served on the Management Committee of the General Federation of Trade Unions from 1921, becoming chair in 1928 and 1929, and later being a trustee.