The Light Middleweight Division (also known as Junior Middleweight in the IBF or Super Welterweight in the WBA and WBC), is a weight division in professional boxing, for fighters who weigh between 147–154 pounds.

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This division was established in 1962, when the Austrian Board of Control recognized a fight between Emile Griffith and Teddy Wright for the "world" championship. The fight, which took place on October 17, was won by Griffith via a 15-round decision.

Three days later, the World Boxing Association championship was created when Denny Moyer outpointed Joey Giambra. The World Boxing Council recognized the WBA champion as the true division champion until 1975, when it stripped their current champion and sanctioned a fight between Miguel de Oliveira and Jose Duran for the vacant title. De Oliveira won the title over 15 rounds in 1975.

The International Boxing Federation crowned its first champion when Mark Medal defeated Earl Hargrove in 1984, while the World Boxing Organization crowned its first champion when John David Jackson defeated Lupe Aquino in 1988.

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This hybrid division mirrored the popular middleweight class by featuring fighters who had the power of heavyweights and the speed of lightweights. While many boxers have appeared in fights as light middleweights, relatively few have fought their entire career exclusive in the division, even when it proved to be the fighter's best weight class. The glamor and money still resided in the original middleweight class.

One look at the best fighters who've ever fought as a light heavyweight proves that the division is often viewed as a transitory weight class that offered a title and a chance to adjust until moving up to the full middleweight class: 

Super Middleweight Alums who held the title includes: Nino Benvenuti, Manny Pacquiao, Wilfred Benítez, Sugar Ray Leonard, Miguel Cotto, Thomas Hearns, Mike McCallum, Terry Norris, and Winky Wright.