Jacob Rehm (December 7, 1828–April 6, 1915) was a policeman, politician, and businessman served several tenures as the head of the Chicago Police Department.

He was also involved in crime schemes, being sentenced to six months of prison in 1876 for his role in Chicago's segment of the Whiskey Ring.

On April 6, the board appointed Cyrus P. Bradley to assist Rehm in supervising the police force.

[4] Rehm succeeded Bradley as the general superintendent of police, serving from February 20, 1863, until July 3, 1863.

[6] After William Turtle resigned as general superintendent of police in November 1865, and Rehm was appointed to the position again.

[1][4] In 1867, a major labor strike occurred in Chicago over demands for an eight-hour day, and Rehm was tasked with keeping the peace.

[4] On February 8, 1869, he was appointed to additionally serve a five-year term as an inaugural commissioner of Lincoln Park.

[4] During this tenure, in exchange for $30,000, Rehm provided McDonald access to confidential police records.

[7] McDonald and Rehm also collaborated as part of the Whiskey Ring, in which they would siphon federal tax dollars from alcohol tax and would funnel the money into Rehm's personal bank accounts, as well as bank accounts of Anton C. Hesing and other political allies of McDonald.

[4] Rehm would ultimately serve six months of prison time and pay a $10,000 fine for his role in the Whiskey Ring.