Chad Keith Green (born May 24, 1991) 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 Toronto Blue Jays.

Green was born in Greenville, South Carolina to Howard and Sheena Green. He has a twin brother, Chase, who played shortstop for Southern Illinois University Edwardsville, as well as an older sister, Lynsie, and an older brother, Blake.

Green was a three-time All-Apollo Conference selection, a two-time All-Area honoree and an All-State selection as a senior for Effingham High School in Effingham, Illinois. He was drafted by the Toronto Blue Jays in the 37th round of the 2010 MLB draft from high school, but did not sign. Instead, Green enrolled at the University of Louisville, where he played college baseball for the Louisville Cardinals. He left as the school record holder in career earned run average (ERA), at 2.38. In 2011 and 2012, he played collegiate summer baseball with the Bourne Braves of the Cape Cod Baseball League.

The Detroit Tigers selected Green in the 11th round of the 2013 MLB draft. He made his professional debut that year with the GCL Tigers, and after two games, was promoted to the Lakeland Flying Tigers where he finished the year with a 3–0 record and a 3.63 ERA in 17+1⁄3 innings pitched. He pitched for the West Michigan Whitecaps in 2014 where he was 6–4 with a 3.11 ERA in 23 starts. In 2015, he played for the Erie SeaWolves where he compiled a 5–14 record with a 5.93 ERA in 27 starts.

On December 9, 2015, the Tigers traded Green and Luis Cessa to the New York Yankees for Justin Wilson. He received a non-roster spring training invitation on February 5, 2016. He began the year with the Scranton/Wilkes-Barre RailRiders.

The Yankees promoted Green to the major leagues on May 14, 2016. He made his major league debut on May 16. After being called up as a reliever, the Yankees shifted Green to the rotation. After four starts, the Yankees shut down Green for the season when he suffered a sprained elbow ligament. Green appeared in 12 games (eight starts), with a 2–4 record, 4.73 ERA and 52 strikeouts in 42+2⁄3 innings.

Green reported to spring training in 2017 as a starter. Instead of naming a fifth starter, the Yankees optioned him to the minors and carried an extra reliever instead. On May 8, Green was called up to the Yankees. Green made his season debut with the Yankees on May 9 and was used primarily as a reliever for the season. On June 11, Green made his first start of season, a spot start, against the Baltimore Orioles. He allowed two runs in two innings, striking out three. Green ended the season with a 5–0 record, 1.83 ERA and 103 strikeouts in 69 innings. He and Dellin Betances became the sixth pair of teammates to strike out 100 batters as a reliever. In the first inning of the 2017 American League Wild Card Game, Green relieved Luis Severino with two runners on base after three runners had scored. Green ended the inning with consecutive strikeouts and later pitched a scoreless second inning before being taken out in the third inning. In two innings pitched, Green allowed one earned run and struck out four. He finished the 2017 season with a 5–0 record, a 1.83 ERA, and a 0.74 WHIP in 40 games.

Green spent the entire 2018 season with the big league club. Following the acquisition of Zack Britton on July 24, Green was pushed down in the pecking order. He fell into mid-season skid where he posted a 6.75 ERA across 12 appearances. To get out of it, he reintroduced a changeup into his repertoire.