Thomas J. O'Brien (Illinois politician)

Thomas J. O'Brien
Member of the U.S. House of Representatives
from Illinois's 6th district
In office
January 3, 1943 – April 14, 1964
Preceded by A. F. Maciejewski
Succeeded by Daniel J. Ronan
In office
March 4, 1933 – January 3, 1939
Preceded by James T. Igoe
Succeeded by A. F. Maciejewski
Cook County Sheriff
In office
1938–1942
Preceded by John Toman
Succeeded by A. L. Brodie
Personal details
Born April 30, 1878
Chicago, Illinois
Died April 14, 1964 (aged 85)
Bethesda, Maryland
Resting place Queen of Heaven Cemetery
Political party Democratic

Thomas Joseph O'Brien (April 30, 1878 – April 14, 1964) of Chicago was a U.S. Representative from Illinois, 1933–39, 1943–64, and as Cook County Sheriff from 1938 through 1942. He was of the Democratic Party. He became the "Dean" of Chicago delegates and played a role in the early career of Dan Rostenkowski.

O'Brien died in office of a stroke on April 14, 1964, and was buried at Queen of Heaven Cemetery in Hillside, Illinois.

The T.J. O'Brien Lock and Dam approximately 7 miles from Lake Michigan on the Calumet River in Chicago at the head of the Illinois Waterway is named after Congressman O'Brien.

See also