Björn Kopplin (born 7 January 1989) is a German professional footballer who plays as a right-back for Danish Superliga club Randers FC.
Kopplin was named in Bayern Munich's squad for the 2008–09 and 2009–10 UEFA Champions League. He was given the number 37 in the first team. On 13 June 2010, VfL Bochum announced that they had signed Kopplin for the following season.
In 2017, Kopplin was signed by Danish team, Hobro IK.
On 26 October 2018, Randers FC announced that they had signed Kopplin from Brøndby IF. He would join the club at the end of 2018.