Charles Harrison Nagy (born May 5, 1967) is an American former Major League Baseball All-Star right-handed pitcher who played for 14 seasons in the major leagues from 1990 to 2003. He played for the Cleveland Indians and San Diego Padres. He served as the pitching coach for the Arizona Diamondbacks from 2011 to 2013 and the Los Angeles Angels from 2016 to 2018.

Nagy was born on May 5, 1967, in Bridgeport, Connecticut. He is of Hungarian ancestry. Nagy attended Roger Ludlowe High School in Fairfield, Connecticut, where he starred in baseball and football.

Nagy attended the University of Connecticut. Playing for the Huskies, he ranked second and eighth all-time for strikeouts in a single season (113, 81) and fifth for his career (194). His single-season marks for the Huskies (entering the 2011 season) include tied for third in complete games (8), tied for sixth in saves (4), and 17th in innings pitched (86+1⁄3). He was the first Huskies player drafted in the first round and the first to be named the Big East Pitcher of the Year, which he won twice (for the 1987 and 1988 seasons).

In 1987, he played collegiate summer baseball with the Harwich Mariners of the Cape Cod Baseball League, and was playoff MVP of Harwich's league championship squad.

Nagy was a member of the U.S. national team that competed in the 1988 Summer Olympics as a demonstration sport. Nagy made 19 appearances for the U.S., going 3–1 with a 1.05 ERA and a team-leading six saves. He appeared in two games in the Olympics, pitching 2.0 innings and earning a save. Team USA defeated defending champion Japan to win the tournament and gold medal. However, since baseball was a demonstration sport, the medals did not count in the respective nations' medal totals.

Nagy was taken in the first round as the 17th overall pick by the Cleveland Indians during the 1988 Major League Baseball draft. He was selected as a compensation pick from the San Francisco Giants for the signing of Brett Butler. Nagy was the second of three first round picks selected by the Indians, sandwiched between shortstop Mark Lewis and pitcher Jeff Mutis. Being a successful college pitcher, Nagy skipped several levels and was assigned to the Kinston Indians, the Cleveland High A affiliate in the Carolina League. He posted an 8–4 record and 1.51 earned run average (ERA) with 99 strikeouts in 95+1⁄3 innings over 13 starts. He was quickly promoted to Canton–Akron Indians, the Double-A affiliate in the Eastern League. Nagy finished with a 4–5 record and a 3.35 ERA in 15 starts. After the season, Baseball America rated him as the #27 prospect.

Nagy returned to the so-called "little Indians" for the start of the 1990 season, where he went 13–8 with a 2.52 ERA in 23 starts. He was soon called up to Cleveland, making his big league debut on June 29, 1990, a 7–2 loss to the California Angels. He would end with a 2-4 record and a 5.91 ERA in 9 starts. In 1991, he finished 10–5 with a 4.13 ERA, and tied for eighth in the American League Rookie of the Year Award for 1991. On August 8, 1992, he threw a complete game one-hitter against the Baltimore Orioles, giving up just a single in the seventh inning, while allowing two walks.

1992 was possibly Nagy's best year statistically as he finished the season with an impressive 2.96 ERA and a career high 252 innings pitched. He had ten complete games. His win-loss record was 17–10, including three shutouts. In the All-Star Game, Nagy batted in the 8th inning because there were no position players remaining to pinch-hit. Nagy hit an infield single off Doug Jones while wearing a Texas Rangers batting helmet. He scored on a single by Travis Fryman. Nagy was the 19th pitcher to get a hit in the All-Star Game, and is the only pitcher to record a hit in the All-Star Game in the designated hitter era.