Arvind, from New York, won the contest by correctly spelling German word "knaidel", which means a small mass of leavened dough, overcoming his fear of German-derived words during his past four appearances at the contest.
"The German curse has turned into a German blessing," he said after besting eight other finalists in a nail-biting two-and-a-half hour finale started with 281 contestants from eight nations.
"The words were extremely hard. It means that I am retiring in a good mood," Arvind said immediately after winning the prestigious national championship.
This is the sixth consecutive year that an Indian-American has won the contest, which was watched live by millions of people in the United States.
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Arvind is also the first boy to win the Scripps National Spelling Bee since 2008. He will take home USD 30,000 in cash and prizes along with a huge, cup-shaped trophy.
Arvind is the eldest son of an IT consultant father and a physician mother from Hyderabad.
"We value language a lot. And I love language, I love English."
Arvind had placed ninth in 2010, then third in 2011 and 2012. More often, German-derived words denied him the championship.
A grade eight student, Arvind loves maths and science and plans to pursue a career as a physicist.
A speaker of Telugu and Spanish, Arvind enjoys tennis, basketball and drama, and counts Novak Djokovic and Shaquille O'Neal among his favourite athletes.
Last three contestants were Indian-Americans. Another thirteen-year-old Indian-American boy Pranav Sivakumar of Tower Lakes, Illinois, finished second while the third place was grabbed by Sriram Hathwar from New York.