Magnus Johannesen (born 2 February 2002) is a Danish badminton player.
Johannesen started to train badminton at the age of six in the Brønderslev club. He is a left-handed like his idol, Lin Dan. Johannesen grew up in a badminton family. His mother Trine Johannesen (née Sørensen) is a Danish former badminton player, while his aunt Mette van Dalm is a bronze medalists in the 1999 World Championships.