Gregory Alan Maddux (born April 14, 1966), nicknamed "Mad Dog" and "The Professor" is a former Major League Baseball pitcher. He was the first pitcher in major league history to win the Cy Young Award for four consecutive years (1992–1995), a feat matched only by Randy Johnson (1999–2002). During those four consecutive seasons, Maddux had a 75-29 record with a 1.98 ERA, while allowing less than one runner per inning.

Maddux is the only pitcher in MLB history to win at least 15 games for 17 straight seasons.  In addition, he holds the record for most Gold Gloves with eighteen. A superb control pitcher, Maddux won more games during the 1990s than any other pitcher, and is 8th on the all-time career wins list, with 355. Since the start of the post-1920 live-ball era, only Warren Spahn (363) recorded more career wins than Maddux. He is one of only 10 pitchers ever to achieve both 300 wins and 3000 strikeouts. He works in the Texas Rangers' front office as the special assistant to the general manager. Not yet a member of the Baseball Hall Of Fame (he is not eligible for inclusion until 2013), Maddux has the most pitching victories of any unelected member.