Niklas Arrhenius is a competitor in the discus throw who won the Swedish competition in this event in 2004 and 2006. He was also Sweden's discus competitor at the 2008 Summer Olympics. Arrhenius is of Swedish descent. Arrhenius is the son of Anders Arrhenius who was a professional shot put competitor in Sweden. Niklas' younger brother, Leif Arrhenius is also a thrower. Arrhenius was raised in Utah but has dual citizenship. He attended Brigham Young University where he was on the track and field team. Arrhenius is a Latter-day Saint. He served as an LDS missionary in the Sweden Stockholm Mission. 

September 10th, 1982 in Provo (Age 42)