Herbert James "Duke" Brett (May 23, 1900 – November 25, 1974) was a professional baseball player.

For his career, he compiled a 1–1 record, with a 3.97 earned run average, and 7 strikeouts in 22.2 innings pitched.

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 went on to a long career as a minor league manager, serving as skipper for the Danville Leafs, Rocky Mount Red Sox, Little Rock Travelers, Wilmington Blue Rocks, Wellsville Yankees, Hagerstown Owls, Reidsville Luckies, Raleigh Capitals, Wichita Indians, and Winston-Salem Twins over a twenty-year career from 1934 to 1954.

He was born in Lawrenceville, Virginia and later died in St. Petersburg, Florida at the age of 74.