Kobe Bryant scored 23 points despite 6-of-24 shooting while winning his fifth title with the Lakers, who repeated as NBA champions for the first time since winning three straight from 2000-02.
Ron Artest added 20 points for the Lakers, who shot terribly while trailing for most of the first 3 1/2 quarters. Yet they reclaimed the lead midway through the fourth quarter and hung on with big shots from Pau Gasol and Artest.
With their fifth title in 11 seasons, the Lakers moved one championship behind Boston's 17 banners for the overall NBA lead.
Paul Pierce had 18 points and 10 rebounds for the Celtics, who just couldn't finish the final quarter of a remarkable playoff run after a fourth-place finish in the Eastern Conference. Kevin Garnett added 17 points, but Boston flopped in two chances to clinch the series in Los Angeles after winning Game 5 back home.
After three quarters of mostly terrible offense, the Lakers tied it at 61 on Artest's three-point play with 7:29 left. Bryant's free throws 90 seconds later gave the Lakers their first lead of the second half, and the Lakers went up by five points before Bryant and Sasha Vujacic hit free throws in the final seconds to keep Los Angeles ahead.
The Lakers will relish this title because they took it from the Celtics, their greatest rivals, with fourth-quarter poise and defense. The teams have met in 12 NBA finals, but the Lakers won for just the third time.