Brad Michael Keller (born July 27, 1995) is an American professional baseball pitcher in the Chicago Cubs organization.

[7] On December 14, 2017, Keller was selected by the Cincinnati Reds in the Rule 5 draft and immediately traded to the Kansas City Royals for cash considerations.

[8][9] Keller made the 25-man roster for the Royals in 2018[10] and had his MLB debut on Opening Day, March 29, pitching an inning of scoreless relief against the Chicago White Sox; he struck out the first batter he faced, Adam Engel.

On April 19, 2019, Keller received a five-game suspension by Major League Baseball, which concluded he intentionally threw a pitch that hit Tim Anderson of the Chicago White Sox.

[13] On September 13, 2020, Keller pitched the first complete game shutout of his career against the Pittsburgh Pirates, allowing five hits (only one for extra bases) and one walk, striking out two batters.

[14] With the 2020 Kansas City Royals, Keller appeared in nine games, compiling a 5–3 record with 2.47 ERA and 35 strikeouts in 54+2⁄3 innings pitched.

[22] On May 14, the White Sox announced that Keller would be moved to the rotation to assume the spot vacated by Michael Soroka.

On August 13, Keller rejected an optional assignment to the Triple–A Worcester Red Sox and elected free agency.