I hate to be this obvious but: Michael Jordan. No contest IMO.

After a constant infuse of -1's on this answer I like to add that again, that's MY Opinion.

Some facts to back it up:

Six-time NBA champion (1991-93, 1996-98);
MVP (1988, '91, '92, '96, '98);
10-time All-NBA First Team (1987-93, 1996-98);
All-NBA Second Team (1985);
Defensive Player of the Year (1988);
Nine-time All-Defensive First Team (1988-93, 1996-98);
Rookie of the Year (1985);
14-time All-Star;
All-Star MVP (1988, '96, '98);
One of 50 Greatest Players in NBA History ('96);
Olympic gold medalist (1984, '92).

Also. 30.1 points per game career average. 33.4 on playoffs. 32,294 total career points.

Without a doubt LArry Bird!!!

Wilt Chamberlain dominated the game like no one else I ever saw.

When you watched him play, you really felt sorry for the other team.

Michael Jordon.

MJ greatest EVER

I can only go with what I have witnessed and with these eyes, Jordan stands the test.

micheal jordan.

I would say either Kareem Abdul-Jabbar or Michael Jordan.

I can't speak for the great player like Wilt cause all I've ever seen was highlights. My pick has to be Michael Jordan hands down...

All of you MJ fans are ignorant. MJ was definitely top 1-2 of all time but how can you discount Wilt Chamberlain? The NBA changed all sorts of rules because of him. Although his scoring numbers are about even with MJ's (both 30.1 PPG lifetime), Wilt did it in an era where scores were much lower. Wilt had 22.4 RPG lifetime! That's crazy! Rodman, a prolific rebounder, had 18.7 rebounds in his BEST year! Top rebounder this year? KG with 12.8. MJ's APG lifetime: 5.3. Wilt: 4.4, for a center! The gap between 1-2 and the rest is huge but Wilt's name definitely has to be included with MJ's in any discussion about the greatest player ever. MJ has more rings but Wilt was outright dominant.

Here's an excerpt from NBA.com:
"The record books are indeed heavy with Chamberlain's accomplishments. He was the only NBA player to score 4,000 points in a season. He set NBA single-game records for most points (100), most consecutive field goals (18) and most rebounds (55). Perhaps his most mind-boggling stat was the 50.4 points per game he averaged during the 1961-62 season--and if not that, then perhaps the 48.5 minutes per game he averaged that same year.

He retired as the all-time in career points with 31,419, which was later surpassed by Kareem Abdul-Jabbar, Karl Malone and Michael Jordan. He is tops in rebounds with 23,924. He led the NBA in scoring seven years in a row. He was the league's top rebounder in 11 of his 14 seasons. And as if to prove that he was not a selfish player, he had the NBA's highest assist total in 1967-68.

But the most outstanding figures are his scoring records; Most games with 50+ points, 118; Most consecutive games with 40+ points, 14; Most consecutive games with 30+ points: 65; Most consecutive games with 20+ points: 126; Highest rookie scoring average: 37.6 ppg; Highest field goal percentage in a season: .727. And with many of these, the player in second place is far behind. His name appears so often in the scoring record books that his name could be the default response any time a question arises concerning a scoring record in the NBA.

During his career, his dominance precipitated many rules changes. These rules changed included widening the lane, instituting offensive goaltending and revising rules governing inbounding the ball and shooting free throws (Chamberlain would leap with the ball from behind the foul line to deposit the ball in the basket)."