David Josiah Brewer was an American jurist who served as an associate justice of the Supreme Court of the United States from 1890 to 1910. An appointee of President Benjamin Harrison, he supported states' rights, opposed broad interpretations of Congress's power to regulate interstate commerce, and voted to strike down economic regulations that he felt infringed on the freedom of contract. He and Justice Rufus W. Peckham were the "intellectual leaders" of the Fuller Court, according to the legal academic Owen M. Fiss. Brewer has been viewed negatively by most scholars, though a few have argued that his reputation as a reactionary deserves to be reconsidered.

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.