Axel Müller Aranda (born 25 November 1993) is an Argentine rugby union player. Muller has signed with the French rugby club Toulon to play in the Top 14. He represented Argentina's under-20 team at the 2013 IRB Junior World Championship. He was selected to play for Argentina at the 2016 Summer Olympics. He is a former decathlete and played American football as a youngster. At the age of 9 his father got a job in the United States so he moved with his family and lived in Ahwatukee in Phoenix, Arizona. They moved back to Argentina when he was 17.