Donald Glenn August (born July 3, 1963) is an American former Major League Baseball pitcher and writer who played for the Milwaukee Brewers from 1988 to 1991.

He spent a year in the Astros' minor league system before being traded along with fellow pitcher Mark Knudson to the Brewers on August 15, 1986, in exchange for Danny Darwin.

He finished fourth in the voting for AL Rookie of the Year; Oakland Athletics shortstop Walt Weiss won the award.

After being released by the Brewers, August pitched in the Detroit Tigers farm system in 1992, mostly with the Triple-A Toledo Mud Hens.

As of 2023, August is writing a book about playing baseball overseas, tentatively titled "Foreign Affairs".