Martin Eugen Ekström (6 December 1887 Gålsbo, Avesta Municipality – 28 December 1954 Helsinki) was a Swedish military adventurer who became the leader of the Nationalsocialistiska Blocket, an umbrella organization for various fascist and National Socialist groups. Lieutenant colonel Ekström led the 3rd Battlegroup [1] of the Swedish Volunteer Corps in the Finnish Winter War.