Lightweight is a weight class in combat sports and rowing.

International Kickboxing Federation (IKF) Lightweight (Pro & Amateur) 127.1 lb - 132 lb or 57.77 kg - 60 kg. Women's divisions also use this weight class, but usually at a lower weight than the men's divisions. In Glory promotion, a lightweight division is up to 70 kg (154 lb).^[16]

In ONE Championship, the lightweight division limit is 77.1 kg (170 lb).

The limit for lightweight generally differs among promotions in bare-knuckle boxing:

• In Bare Knuckle Fighting Championship, the lightweight division has an upper limit of 155 lb (70 kg).
• In BKB™, the lightweight division has an upper limit of 79 kg (174 lb).

In World Lethwei Championship, the lightweight division has an upper limit of 60 kg (132 lb).

In MMA, the lightweight division is from 146 lb (66 kg) to 155 lb (70 kg).

At the international level, for crew boats, the limits are:

• Men: Crew average 70 kg (154.3 lb) – no rower over 72.5 kg (159.8 lb)
• Women: Crew average 57 kg (125.7 lb) – no rower over 59 kg (130.1 lb)

For single sculls, the limits are 72.5 kg (159.8 lb) for men and 59 kg (130.1 lb) for women.

Originally, lightweight rowing was a introduced as a category at the 1996 Summer Olympics, due to countries with athletes of smaller average stature competing with an unfair disadvantage, as rowing favors taller athletes who have more leverage.

Current Olympic-class lightweight events in rowing are the men's lightweight double sculls, and the women's lightweight double sculls. From 1996 to 2016, there was also the men's lightweight coxless four event.