Voting is underway now but ends Saturday.
Southpaw is one of this year's nominees, however, he's up against some stiff competition, including "Wally the Green Monster'" of the Boston Red Sox. The Cardinals "Fredbird," Globetrotter's "Globie," and even the very first NHL mascot "Harvey the Hound" are also in the running.
According to the Mascot Hall of Fame website, Southpaw made his major league debut on June 13, 2004. He was even at the 2009 Presidental Inauguration of former president Barack Obama.
RELATED: See the history of Chicago's sports mascots
"Southpaw's favorite activities include dancing, high fives, and his signature arm wave. He is also known for his silly antics, hip-swinging dance moves, and fan experiences by giving autographs and taking photos, as well as out-of-this-world game day costumes," the website says.
You can cast your vote on the Mascot Hall of Fame website, but get it in soon because voting ends at midnight Saturday.