John Madison Younginer IV (born November 3, 1990) is an American former professional baseball pitcher.

The Boston Red Sox selected Younginer in the seventh round of the 2009 Major League Baseball draft.

[8] In 40 games (3 starts) for Oklahoma City, he posted a 4–5 record and 4.76 ERA with 70 strikeouts and 8 saves in 62+1⁄3 innings pitched.

[10] On January 25, 2018, Younginer signed a minor league deal with the San Francisco Giants organization.

[12] On July 28, 2020, Younginer came out of retirement to sign with the Sioux Falls Canaries of the American Association of Independent Professional Baseball.