Timothy D. "Big Tim" Murphy (1885 – June 26, 1928) was a Chicago mobster and labor racketeer who controlled several major railroad, laundry and dye workers' unions during the 1910s and early 1920s.

[1] Born in 1885, Murphy rose to prominence at the beginning of the 20th century in the bookmaking racket with then-partner Mont Tennes.

In February 1921, Murphy was charged with involvement in organizing the theft of $400,000 (equivalent to US$6,832,836 in 2023) from a Pullman mail train at Chicago's Union Station in August 1920.

Although he was released on a $30,000 bond, Murphy was eventually convicted and sentenced by Judge Kenesaw Mountain Landis to seven years imprisonment.

[5] On May 6, 1922, Murphy, Cornelius Shea, and six other labor leaders were arrested and charged with the murder of a Chicago police officer.