James Thomas Brownlie (23 June 1865 – 13 October 1938) was a British trade unionist and politician.
In the late 1880s, he moved to London to work at the Royal Arsenal, and became active in the Amalgamated Society of Engineers (ASE).
In this role, he chaired a joint committee of engineering unions which, in the aftermath of World War I, negotiated the 47-hour working week.
During this period, he also served on the National Advisory Committee on War Output and the executive of the International Metalworkers' Federation.
He stood for Labour at the Sunderland by-election in 1931, taking 39.8% of the votes cast, but did not stand in the general election later the same year.