Deolis Alexander Guerra (born April 17, 1989) is a Venezuelan professional baseball pitcher for the Saraperos de Saltillo of the Mexican League.

On July 8, 2007, Guerra represented the New York Mets' organization for the World Team in Major League Baseball's All-Star Futures Game.

[1] Along with outfielder Carlos Gómez and pitchers Philip Humber and Kevin Mulvey, Guerra was traded to the Minnesota Twins for Johan Santana on January 29, 2008.

[2] With the Fort Myers Miracle, he compiled a 7–2 record with a 4.83 earned run average in the first half of the 2008 season—helping his team capture the Florida State League (FSL) first-half West Division title.

Guerra's first start in the second half of the 2008 season (Tuesday, July 1) was a 4–0 complete game shutout of the Tampa Yankees.

[12] The Pirates designated Guerra for assignment after the 2015 season, but signed him to a minor league contract with an invitation to 2016 spring training.

[20] On December 8, 2018, Guerra signed a minor league deal with the Milwaukee Brewers that included an invitation to spring training.

[28] On February 2, 2021, Guerra signed a minor league contract with the Oakland Athletics organization and was invited to Spring Training.

[29] On March 26, Guerra was released by the Athletics, but re-signed with the club the next day on a new minor league contract.

[33] On April 13, it was announced that Guerra had undergone Tommy John surgery, and would miss the entire 2022 season.

Guerra returned to action in 2023 and posted a combined 9.95 ERA in 6 appearances between the rookie–level Arizona Complex League Athletics and Triple–A Las Vegas Aviators.