Greg Lomack Allen (born March 15, 1993) is an American professional baseball outfielder who is a free agent.

He has previously played in Major League Baseball (MLB) for the Cleveland Indians, San Diego Padres, New York Yankees and Pittsburgh Pirates.

[6] In 2015, he played for the Lake County Captains[7] where he slashed .273/.368/.382 with seven home runs, 45 RBIs, and 43 stolen bases in 123 games.

[8] In 129 total games between the two teams, he batted .295 with seven home runs, 44 RBIs, 45 stolen bases, and an .830 OPS.

After the season, the Indians assigned Allen to the Mesa Solar Sox of the Arizona Fall League.

[10] In 71 games for Akron prior to his promotion he was batting .264 with two home runs, 24 RBIs, and 21 stolen bases.

On August 31, 2020, the Indians traded Allen, along with Mike Clevinger and Matt Waldron, to the San Diego Padres in exchange for Austin Hedges, Josh Naylor, Cal Quantrill, and minor league players Gabriel Arias, Owen Miller, and Joey Cantillo.

[18] On February 23, 2021, Allen was designated for assignment by the Yankees after the Justin Wilson signing was made official.

[24] In an April 3, 2022, game against the Tampa Bay Rays during spring training, Allen tweaked his hamstring.

[30] On May 19, 2023, Allen was traded to the Yankees in exchange for minor-league pitcher Diego Hernández and cash considerations, marking his second stint in New York.

[30] Allen was selected to the Yankees' active roster the next day, after Aaron Hicks was designated for assignment.