Herbert James "Duke" Brett (May 23, 1900 – November 25, 1974) was a professional baseball player. He was a right-handed pitcher over parts of two seasons (1924–25) with the Chicago Cubs. For his career, he compiled a 1–1 record, with a 3.97 earned run average, and 7 strikeouts in 22.2 innings pitched. Brett signed with the Cubs as an amateur free agent in 1924. He made his major league debut as the Cubs' starting pitcher on August 8, 1924 in a 10–7 win over the Boston Braves. Brett did not figure in the decision. It was his only appearance in his rookie year.