The bantamweight division in mixed martial arts refers to a number of different weight classes:
*The UFC's bantamweight division with upper limit at 135 lb (61.2 kg)
*The King of the Cage bantamweight class with upper limit at 145 lb (65.8 kg)
*The Shooto bantamweight division, which suits competitors below 56 kg (123.5 lb)
*The Dream (''defunct'') bantamweight division, which limited competitors to 61 kg (134.5 lb)
The bantamweight division sits between the lighter flyweight division and the heavier featherweight and/or lightweight divisions.
==Ambiguity and clarification==
For the sake of uniformity, many American mixed martial arts websites refer to competitors between 126 and 135 lb (57 and 61 kg) as bantamweights, This encompasses both the Shooto Featherweight division (132 lb / 60 kg) and the King of the Cage Flyweight division (135 lb / 61 kg). The UFC uses the Nevada definition of "bantamweight".
Prior to ''UFC 31'', 150-pound (68 kg) fighters were known as bantamweights in the Ultimate Fighting Championship. After which, the weight limit was raised to 155 lb (70 kg), and the division became reinstated as the lightweight class.
The bantamweight limit, as defined by the Nevada State Athletic Commission and the Association of Boxing Commissions〔(【引用サイトリンク】title=Unified Rules of MMA )〕 is 135 lb (61 kg).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』