William James Jameson (August 8, 1898 – October 8, 1990) was a United States federal judge.
Born in Butte, Montana, Jameson received an A.B. from the University of Montana in 1919 and an LL.B. from the University of Montana School of Law in 1922. He was in private practice in Billings, Montana from 1922 to 1957. He was a member of the Montana House of Representatives from 1927 to 1930.
Jameson was a federal judge on the United States District Court for the District of Montana. Jameson was nominated by President Dwight D. Eisenhower on March 5, 1957, to a seat vacated by Charles N. Pray. He was confirmed by the United States Senate on March 26, 1957, and received his commission on March 28, 1957. He served as chief judge from 1965-1968. He assumed senior status on February 27, 1969. Jameson served in that capacity until his death.
The William J. Jameson Law Library at the University of Montana School of Law is named after Jameson.
The State Bar of Montana's highest honor is named after Jameson. The William J. Jameson Award has been given annually since 1989 to a Montana attorney who, among other criteria, "Shows ethical and personal conduct, commitment and activities that exemplify the essence of professionalism."