Champions Charlton defeated Hartlepool to end the season on 101 points.
The visitors went ahead when Peter Hartley tapped past Ben Hamer from Neil Austin's corner, but a spectacular volley from Danny Hollands made it 1-1.
Danny Haynes scored a close-range header to put the Addicks ahead before Yann Kermorgant extended their lead by shooting home from a narrow angle.
Gary Liddle's deflected effort late on gave Hartlepool hope but Charlton held on for their 30th win of the season.
After the game, Charlton were presented with the League One trophy as they finished eight points clear of runners-up Sheffield Wednesday and 11 points ahead of third-placed Sheffield United.
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Charlton manager Chris Powell told BBC London 94.9:
"Well it's something that doesn't happen too often at football clubs and we've been in the doldrums for a long time.
"I just want everyone to enjoy the day, it was brilliant, a great day.
"We went behind, we had character, great determination, great goals. It was a fantastic day for everyone.
"It wasn't a Charlton I knew as a player when I came back here in 2011 and it was tough to take but we made changes and it's paid off."