Marcus Jonas Munuhe Olsson (born 17 May 1988) is a Swedish professional footballer who plays as a midfielder and a left-back for Halmstad.

[8] Marcus Olsson made his debut for Blackburn Rovers in the 3–0 away defeat to Manchester City in the Premier League on 25 February 2012, playing on the left wing, in front of his twin Martin who played at left back, with both completing a full 90 minutes.

[12] On 26 January 2016, Olsson was transferred from Blackburn to Derby County for an undisclosed fee, signing a three-and-a-half-year contract.

[17] Marcus Olsson was called up to the annual January tour of the Sweden national team in 2012, facing Bahrain and Qatar U23.

Their brother-in-law is former Dallas Mavericks basketball player Dirk Nowitzki, who married their older sister Jessica.