Sean Dylan Kelly (born May 17, 2002) is an American motorcycle racer. He previously competed in the AMA Supersport Championship with the M4 Ecstar Suzuki team, having won the championship in 2021.

In 2019, Kelly made his AMA Supersport debut aboard the Suzuki GSX-R600 of M4 Ecstar Suzuki. In his first season of the championship, he recorded two victories, both at the Pittsburgh International Race Complex and five podiums, which allowed him to finish the season in fourth place.

Kelly continued on the M4 Ecstar Suzuki in 2020^[1] and that season, he showed his high level. He had won five races (one at Atlanta,^[2] The Ridge,^[3] New Jersey and two at Laguna Seca),^[4] eleven podiums and three poles in 18 races. He finished the season runner-up with 341 points, forty less than champion, Richie Escalante.

The 2021 AMA Supersport Championship season was the demonstration of power for Kelly in the category. He achieved twelve victories (one in Virginia, Pittsburgh, New Jersey^[5] and Alabama and two in Atlanta,^[6] Washington,^[7] Laguna Seca^[8][9] and Minnesota),^[10] five second places and one sixth place was his worst finishing position of the season over 18 races. Also this season, he achieved all the poles that were contested and half of the fastest laps awarded. With his second-place finish in New Jersey Race 2, Kelly became the AMA Supersport champion one round before the end of the championship.^[11]