Justus Kane Sheffield (born May 13, 1996) is an American professional baseball pitcher who is a free agent.

He has previously played in Major League Baseball (MLB) for the New York Yankees and Seattle Mariners.

[1] He finished his senior season with an 11-0 record, a 0.34 earned run average (ERA), and 131 strikeouts in 61+2⁄3 innings pitched.

[9] On July 31, 2016, the Indians traded Sheffield along with Clint Frazier, Ben Heller, and J. P. Feyereisen to the New York Yankees for Andrew Miller.

[12] He finished the 2016 season with the Tampa Yankees of the High-A Florida State League, where he posted a 10-6 record with a 3.09 ERA.

[20] In August, the Yankees converted him into a relief pitcher in preparation for a September call-up to the major leagues.

[21] He made his MLB debut on September 19 against the Boston Red Sox and gave up a single to his first batter, Brock Holt.

[22] On November 19, 2018, the Yankees traded Sheffield, Dom Thompson-Williams, and Erik Swanson to the Seattle Mariners for James Paxton.

[26] He pitched to a 6.87 ERA in 13 appearances for the Triple-A Tacoma Rainiers before the Mariners demoted him to the Double-A Arkansas Travelers.

His final appearance for the Mariners was a start on October 4, earning a win and allowing four runs in five innings pitched.

[36] Sheffield was designated for assignment on January 19, 2023, to make room for Tommy La Stella on the roster.

[40] He spent the remainder of the season with the Triple-A Gwinnett Stripers, also appearing in one game for the Double-A Mississippi Braves.