Nicholas James Wittgren (born May 29, 1991) is an American professional baseball pitcher who is a free agent.

He has previously played in Major League Baseball (MLB) for the Miami Marlins, Cleveland Indians, St. Louis Cardinals and Kansas City Royals.

[1] He served as the closer for Purdue during his two years, finishing with a 2.54 earned run average (ERA), 22 saves and 94 strikeouts over 92 innings pitched.

[3] During his first professional season he had a 1.17 ERA, 13 saves and 47 strikeouts over 30+2⁄3 innings while playing for the Jamestown Jammers and Greensboro Grasshoppers.

The next season he spent time between the Triple–A level and the Marlins bullpen, appearing in 38 games with a 4.68 ERA in 42+1⁄3 innings.

With the 2020 Cleveland Indians, Wittgren appeared in 25 games, compiling a 2-0 record with 3.42 ERA and 28 strikeouts in 23.2 innings pitched.

On December 23, 2022, Wittgren signed a minor league contract with the Kansas City Royals.

[17] He was assigned to the Triple-A Omaha Storm Chasers to begin the 2023 season, making 17 appearances and registering a 1.25 ERA with 19 strikeouts and five saves in 21+2⁄3 innings pitched.

[23] In 40 appearance split between the Double–A Wichita Wind Surge and Triple–A St. Paul Saints, he posted a combined 2–3 record and 5.58 ERA with 52 strikeouts across 59+2⁄3 innings pitched.