Alexander Richard Ludwig (born May 7, 1992) is a Canadian actor, singer and model. He portrays Bjorn in the History Channel series Vikings.
He is best known for his role as Cato in The Hunger Games and as Bjorn in History's hit historical drama, "Vikings."
His notable film credits include The Seeker: The Dark Is Rising, Lone Survivor, Disney's Race to Witch Mountain, When the Game Stands Tall, and The Hunger Games.
He has been cast as the second depiction of Bjorn, from adolescence to a young man and aspiring leader. He plays the older version of Ragnar "Lothbrok"'s son, Bjorn, in Vikings.