Speedifist is a young Viking from the How to Train Your Dragon book series.
Speedifist is introduced in "How to Train Your Dragon" (book #1). He is known to be the fastest Viking novice, as well as an excellent warrior. He has an Eaglefly for a Hunting Dragon and for riding a very fast Swiftglider. He is best friends with Tuffnut Junior. Speedifist is also the only known "non-stereotypical"-featured Viking.