Matthew David Koch (born November 2, 1990) is an American professional baseball pitcher who is a free agent.

[4] He made his professional debut with the Low-A Brooklyn Cyclones, and recorded a 5.01 ERA in 13 games for the club.

In 2013, Koch pitched for the Single-A Savannah Sand Gnats, registering a 6–4 record and 4.70 ERA with 68 strikeouts.

In 2014, Koch spent the season with the High-A St. Lucie Mets, pitching to a 10–4 record and 4.64 ERA in 120.1 innings of work.

[5] On August 30, 2015, the Mets traded Koch and Miller Diaz to the Arizona Diamondbacks in exchange for Addison Reed.

On April 28, 2019, Koch was designated for assignment by the Diamondbacks after recording a 9.15 ERA and 3.92 K/9 in 20 innings pitched.

[12] On December 13, 2019, Koch signed a one-year deal with the Tokyo Yakult Swallows of Nippon Professional Baseball (NPB).

[15] On April 23, 2021, Koch signed a minor league contract with the Cleveland Indians organization.

He began the 2023 season with the Triple–A Albuquerque Isotopes, where he made 29 appearances and struggled to a 7.27 ERA with 34 strikeouts and 2 saves in 34+2⁄3 innings pitched.

On June 27, 2023, the Rockies selected Koch's contract, adding him to the major league roster.