The 1990–91 NBA season was the Bucks' 23rd season in the National Basketball Association. During the offseason, the Bucks acquired Frank Brickowski from the San Antonio Spurs. The Bucks started the season on a strong note winning their first 18 home games on their way to a 25–8 start. However, they would lose ten of their next twelve games. Ricky Pierce and Alvin Robertson were both selected for the 1991 NBA All-Star Game. At midseason, Pierce was traded to the Seattle SuperSonics for Dale Ellis. The Bucks would make their 12th consecutive playoff appearance finishing third in the Central Division with a 48–34 record, while posting a 33–8 home record at the Bradley Center. In the first round of the playoffs, the Bucks were swept by the 5th-seeded Philadelphia 76ers in three straight games. This would be their final playoff appearance until 1999.

(4) Milwaukee Bucks vs. (5) Philadelphia 76ers: 76ers win series 3-0

Last Playoff Meeting: 1987 Eastern Conference First Round (Milwaukee won 3-2)

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