Matthew Phillip Dermody (born July 4, 1990) is an American professional baseball pitcher for the Toros de Tijuana of the Mexican League.

He has previously played in Major League Baseball (MLB) for the Toronto Blue Jays, Chicago Cubs, and Boston Red Sox.

He has also played in Nippon Professional Baseball (NPB) for the Saitama Seibu Lions and in the KBO League for the NC Dinos.

[2] Dermody was selected by the Pittsburgh Pirates in the 26th round of the 2009 Major League Baseball draft, but did not sign and instead attended the University of Iowa.

[3] In 2012, Dermody won Iowa's Big Ten Sportsmanship Award, and pitched to a 1–7 record, 4.50 ERA, and 60 strikeouts in 76 innings.

[6] The Diamondbacks organization determined that he had a 40 percent tear of the left ulnar collateral ligament, and fearing the injury would require Tommy John surgery, declined to offer him a contract.

[2] The Toronto Blue Jays selected Dermody in the 28th round of the 2013 Major League Baseball draft, and he signed on June 14.

[3] Dermody remained in Dunedin to open the 2016 season, and made 16 relief appearances with a 1.96 ERA before being promoted to the Double–A New Hampshire Fisher Cats.

[11] Dermody wound up making 5 appearances with Toronto, failing to retire a batter in the final two en route to a 12.00 ERA.

[26] On January 21, 2021, Dermody signed a one-year contract with the Saitama Seibu Lions of Nippon Professional Baseball (NPB).

[28] He appeared in 20 games (13 starts) for the Triple-A Iowa Cubs, logging a 6–3 record and 3.74 ERA with 70 strikeouts in 79+1⁄3 innings pitched.

On August 4, Dermody was selected to the major league roster to serve as the 27th man in the Cubs' doubleheader against the St. Louis Cardinals.

[32] He was assigned to the Triple–A Worcester Red Sox, where he made 9 appearances (8 starts) and posted a 4.50 ERA with 47 strikeouts in 44.0 innings pitched.

[40] The following week, after Dermody had pitched for Boston and then had been sent back to the minor leagues, chief of baseball operations Chaim Bloom noted that the Red Sox had found "other concerning things on social media.