Samuel Harrison Mattis (born March 19, 1994) is an American Olympic track and field athlete who competes in the discus throw, and has a personal record of 68.69 meters.

His father was the captain of the William & Mary track & field team in 1985, held the 35-lbs weight throw record, and ranks No.

[2][3][4] He attended the Wharton School of Business at the University of Pennsylvania, and graduated with a Bachelor of Science in Finance and Operations Management.

The U.S. Track & Field and Cross Country Coaches Association selected him as the 2015 Male Scholar Athlete of the Year for Division I.

Mattis represented the United States at the 2024 Summer Olympics in Men's discus throw at Stade de France in Paris.