Naoyuki Uwasawa

is a Japanese professional baseball pitcher for the Fukuoka SoftBank Hawks of Nippon Professional Baseball (NPB). He has previously played in NPB for the Hokkaido Nippon-Ham Fighters and in Major League Baseball (MLB) for the Boston Red Sox.

Career Hokkaido Nippon-Ham Fighters Uwasawa debuted for the Hokkaido Nippon-Ham Fighters in 2014. He was selected to the 2018 NPB All-Star game. On October 10, 2018, he was selected Japan national baseball team at the 2018 MLB Japan All-Star Series.

After the 2023 season, the Fighters posted Uwasawa to Major League Baseball teams.

Boston Red Sox On January 11, 2024, Uwasawa signed a minor league contract with the Tampa Bay Rays. On March 27, after triggering an assignment clause in his contract, he was traded to the Boston Red Sox in exchange for cash considerations. The next day, he was selected to the 40-man roster and optioned to extended spring training. On April 28, Uwasawa was recalled from the Triple-A Worcester Red Sox and promoted to the majors for the first time. On May 2, Uwasawa made his MLB debut, pitching two innings in a game against the San Francisco Giants; he collected his first MLB strikeout, against Michael Conforto. Uwasawa was designated for assignment by the Red Sox on July 9. He cleared waivers and was sent outright to Worcester on July 13. Uwasawa elected free agency on October 31.

Fukuoka SoftBank Hawks On December 18, 2024, Uwasawa signed a four–year contract with the Fukuoka SoftBank Hawks of Nippon Professional Baseball. He made 23 appearances for Fukuoka in 2025, logging a 12–6 record and 2.74 ERA with 115 strikeouts across innings pitched. With the Hawks, Uwasawa won the 2025 Japan Series.