Wesley James "Jim" Liebeler (May 9, 1931 – September 25, 2002) was an American law professor at the University of California, Los Angeles ( emeritus) and George Mason University, Warren Commission staff member, and director of the Federal Trade Commission’s Office of Policy Planning and Evaluation. ^{[1] [2]}

Liebeler was born in Langdon, North Dakota. ^[1] He received a BA in 1953 from Macalester College and a JD in 1957 from the University of Chicago Law School where he was a member of the Order of the Coif and served on the editorial board of the University of Chicago Law Review. ^{[3] [4]} Prior to joining the Warren Commission, he practiced law on Wall Street. ^[2] In 1965 Liebeler joined the UCLA Law School, where he taught antitrust law for more than 30 years. ^{[1] [2]} In 1999 he joined George Mason’s School of Law and gave courses in antitrust and constitutional political economy law. ^{[1] [2]}

Liebeler and his flight instructor were killed in 2002 when their Piper Twin Comanche crashed into New Hampshire's Lake Winnipesaukee. ^[5] The National Transportation Safety Board summarized the probable cause of the accident: "The flight instructor's failure to maintain airplane control, which resulted in an uncontrolled collision with water." ^[6]

He was married to Susan Liebeler. ^{[2] [7]}

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