Atomweight (also referred to as light minimumweight, junior strawweight, junior mini-flyweight and pinweight) is a weight class in combat sports.

In women's boxing and junior amateur boxing pinweight is, or has been, a weight class for boxers weighing in under 102 pounds (46 kg) (before 2003, 45 kg).

In September 2010 the women's class in amateur boxing was partly merged into an extended 45–48 kg light flyweight division, with women weighing less than 45 kg excluded from competition. Pinweight is still defined for junior contests.

Current Champions (Last updated on December 22, 2025)

Sanctioning Body	Reign Began	Champion	Record	Defenses
WBA	November 21, 2025	Isabel Rivero	12–3–1 (1 KO)	0
WBC	October 25, 2025	Camila Zamorano	13–0 (1 KO)	1
IBF		vacant
WBO		vacant

As of December 22, 2025.^[1]

Keys:

 C  Current The Ring world champion

Rank	Name	Record	Title(s)
C	vacant
1	Sumire Yamanaka	9–1 (3 KO)
2	Camila Zamorano	13–0 (1 KO)	WBC
3	Eri Matsuda	8–2–1 (1 KO)
4	Esneidy Rodriguez Olmos	11–0–1 (1 KO)
5	Nao Ugawa	6–0 (0 KO)

year	World	European
2001	Elena Sabitova	Oria Mahmoud
2002	Mary Kom
2003		Camelia Negrea
2004		Elena Sabitova
2005	Mary Kom	Elena Sabitova
2006	Mary Kom	Steluta Duta
2007		Steluta Duta
2008	Mary Kom
2009		Svetlana Gnevanova

The atomweight division in mixed martial arts generally refers to competitors weighing less than 105 lb.

• Strawweight
• List of current female world boxing champions

• Coming into effect September 2010: AIBA, Technical & Competition Rules 2011, Appendix K
• In effect 2002–August 2010: AIBA, Technical & Competition Rules, Rule VIb