The wide receiver will vist with fans and talk about playing for the Ravens. He will also talk about what he sees for the team for the rest of the season.
He will appear at the store from 5 p.m. to 6:30 p.m.
The eight-year veteran is a three-time Pro Bowler and was the 2003 NFL Offensive Rookie of the Year.
He is the latest athlete to sign a deal with the Baltimore sports apparel company. As part of the deal, Boldin wears Under Armour cleats and apparel and makes appearances at stores and in television and print advertising spots.
Other athletes who have signed with Under Armour in recent years include Miles Austin, Ray Lewis, Brandon Jacobs and Vernon Davis.