The Cincinnati Reds' 1990 season was the Reds' 122nd season in American baseball. Starting with a club best nine straight wins to open the season, as well as holding the top spot in the National League West every game during the season, the Reds went 41–21 after 62 games, splitting the remaining 100 games 50–50 to end up with a 91–71 record. It consisted of the 91–71 Reds winning the National League West by five games over the second-place Dodgers, as well as the NLCS in six games over the Pittsburgh Pirates, and the World Series in a four-game sweep over the overwhelming favorite Oakland Athletics, who had won the World Series the previous year. It was the fifth World Championship for the Reds, and their first since winning two consecutive titles in 1975 and '76.

Louis Victor Piniella is a former professional baseball player and manager. An outfielder, he played 18 seasons in Major League Baseball (MLB) with the Baltimore Orioles, Cleveland Indians, Kansas City Royals and New York Yankees. During his playing career, he was named AL Rookie of the Year in 1969 and captured two World Series championships with the Yankees.