Robert Jacob "Jake" Arnold (born January 3, 1984 in Santa Rosa, California) is a decathlete from the United States. He represented the United States in the decathlon at the 2007 and 2009 World Championships ranking 13th and 24th respectively. He became the first athlete to win back-to-back NCAA decathlon titles in over twenty years after winning the event in both 2006 and 2007. His personal best in the decathlon is 8253 points, while his indoor heptathlon best is 5909 points.