Are there any 8th seeded teams in NBA to win the championship?

Eighth Seed Upsets. May 1 -- The Golden State Warriors could be the first No. 8 seed to topple a No. 1 seed in a seven-game series as they take on the top-seeded Mavericks in Game 6 on Thursday at ... The loose and lively Nuggets pounded the Sonics 110-93 in Game 3, then pulled out a 94-85 overtime win in Game 4. read more

To my knowledge, no. The NBA went to the 16-team playoff format in the 80’s (1985, I believe). There have been just 4–5 times since that the 8th seed won a first-round series, let alone advanced further and especially won the championship. I believe the lowest seed to win an NBA title was sixth. read more