Mike David Ortmann (born 26 October 1999 in Brandenburg) is a German racing driver.

Ortmann began karting in 2010 at the age of eleven, competing in championships across Germany and taking titles in the championship at East Saxon State and the East German ADAC Kart Cup in 2012.

He remained in the sport for the following season, taking three victories, a pole and a fastest lap to finish third in the championship.

Ortmann joined the 2017 ADAC GT Masters to drive an Audi R8 for Mücke Motorsport, partnering with Frank Stippler.

† As Ortmann was a guest driver, he was ineligible to score points.