Bill Russell holds the record for the most championships won by a player in NBA history with 11.
Russell played his entire career with the Celtics and won the NBA title in all but two years he played. Russell's first title came his rookie season, and then after missing out on the repeat his second year, Boston won eight consecutive championships from 1959-1966. his final two championships came in his last two years as the Celtics completed their most recent back-to-back title run in 1968-1969.
During his final three seasons, Russell was also the coach of the Celtics.