The Chicago Bulls won 6 championships in the 1990s. Their titles came in 1991, 1992, 1993, 1996, 1997, and 1998.
The dynasty was built around Michael Jordan, Scottie Pippen, and coach Phil Jackson. Chicago won three straight championships from 1991 through 1993, then added another three-peat from 1996 through 1998 after Jordan returned from his first retirement.
The Bulls defeated the Los Angeles Lakers, Portland Trail Blazers, Phoenix Suns, Seattle SuperSonics, and Utah Jazz twice in those six NBA Finals. Their 1995–96 team went 72–10 in the regular season, setting an NBA record at the time.
A common mix-up is counting the 1990 Eastern Conference title or the 1999 season. The Bulls lost the 1990 Finals before their championship run began, and their 1998 title was their sixth and final championship of the decade.