Robert Trimble was a lawyer and jurist who served as Justice of the Kentucky Court of Appeals, as United States district judge of the United States District Court for the District of Kentucky and as Associate Justice of the Supreme Court of the United States from 1826 to his death in 1828. During his brief Supreme Court tenure he authored several majority opinions, including the decision in Ogden v. Saunders, which was the only majority opinion that Chief Justice John Marshall ever dissented from during his 34 years on the Court.

An associate justice of the Supreme Court of the United States is a justice of the Supreme Court of the United States, other than the chief justice of the United States. The number of associate justices is eight, as set by the Judiciary Act of 1869.