Jonathan Papelbon -- Jerseys Pulled from Stadium Shop ... After Bryce Harper Attack

Jonathan Papelbon is on the outs in Washington D.C. -- at least his jerseys are ... because staffers at the stadium team shop confirm the pitcher's jerseys have been pulled off the shelves.

TMZ Sports spoke with an employee at the stadium shop at Nationals Park who confirmed ... one of the shop honchos ordered staff to yank all of Papelbon's jerseys off the floor Monday -- after the team suspended the pitcher 4 games for attacking Bryce Harper on Sunday.

A picture of the jersey removal was taken by Nationals fan Jennifer Shiffman -- who noted the switch happened as the Nationals took to the field for Monday's game.