Parker Michael Markel (born September 15, 1990) is an American former professional baseball pitcher. He played in Major League Baseball (MLB) for the Seattle Mariners, Pittsburgh Pirates, and Oakland Athletics.

Markel attended Mountain Ridge High School in Glendale, Arizona. He was drafted by the Detroit Tigers in the 32nd round of the 2009 MLB draft but did not sign. He attended Yavapai College in Prescott, Arizona in 2010.

He was drafted by the Tampa Bay Rays in the 39th round of the 2010 MLB draft, and signed with them.

Markel spent the 2010 through 2016 seasons in the Rays organization. During his time with them, he played for the Gulf Coast League Rays, Hudson Valley Renegades, Bowling Green Hot Rods, Charlotte Stone Crabs, Montgomery Biscuits, and the Durham Bulls.

Markel split the 2016 campaign between Double–A Montgomery and Triple–A Durham, compiling a 7–3 record and 2.78 ERA with 58 strikeouts over 43 combined appearances. He elected free agency following the season on November 7, 2016.

Markel signed with the Lotte Giants of the KBO League during the 2016 offseason, but asked for and was given his release on March 27, 2017, after appearing in only one exhibition game for the Giants.

Markel signed a minor league contract with the Arizona Diamondbacks on December 18, 2017, but was released prior to the start of the season on March 25, 2018.

Markel subsequently signed with the Sioux City Explorers of the independent baseball American Association of Independent Professional Baseball, and spent the 2018 season with them.