Jacob Trieber (October 6, 1853 – September 17, 1927) was a United States federal judge.
Born in Raschkow, Germany, Trieber was the United States Attorney for the Eastern District of Arkansas from 1897 to 1900.
On July 26, 1900, Trieber received a recess appointment from President William McKinley to a seat on the United States District Court for the Eastern District of Arkansas vacated by John A. Williams. Formally nominated on December 4, 1900, Trieber was confirmed by the United States Senate on January 9, 1901, and received his commission the same day. He was the first Jew appointed as a US Federal Judge. Trieber's service ended with his death on September 17, 1927.