Dexter "The Blade" Jackson (born November 25, 1969) is an American IFBB professional bodybuilder and the 2008 Mr. Olympia bodybuilding champion. Jackson has won more professional bodybuilding titles than any other person. He has the distinction of winning the Arnold Classic a record five times (2005, 2006, 2008, 2013, 2015). After winning the Arnold Classic in 2015, he proceeded to place second in the 2015 Mr. Olympia. He is from Jacksonville, Florida.
Dexter's first NPC (National Physique Committee) competition was the NPC Southern States Championship of 1992, where he took 3rd. He first competed professionally in the 1999 Arnold Classic, Night of Champions, and Mr. Olympia contests, placing 7th, 3rd, and 9th, respectively.
At the 2007 Mr. Olympia, Jackson placed 3rd and many critics said he would not likely place any higher. On September 27, 2008, he defeated the reigning two-time Mr. Olympia, Jay Cutler to become the 12th man to win the title, and only the second to have won it and the Arnold Classic title in the same year. Jackson has won the Mr. Olympia title once, sharing this distinction with Chris Dickerson (1982), Samir Bannout (1983), Shawn Rhoden (2018), and Brandon Curry (2019).