Jacob Steven Brentz (born September 14, 1994) is an American professional baseball pitcher in the Tampa Bay Rays organization.

On July 31, 2015, the Blue Jays traded Brentz, Rob Rasmussen, and Nick Wells to the Seattle Mariners in exchange for Mark Lowe.

On September 1, 2016, the Mariners traded Brentz along with Pedro Vasquez to the Pittsburgh Pirates in exchange for Arquimedes Caminero.

[8] On August 20, 2019, Brentz signed a minor league contract with the Kansas City Royals organization.

[16] On November 18, it was announced that the Royals would not tender Brentz a contract for the 2023 season, making him a free agent.

[21] Brentz began the 2024 season in the minor leagues, and struggled to a 12.71 ERA in 20 appearances split between Northwest Arkansas and the Triple–A Omaha Storm Chasers.