弹链（belt）是把大量子弹以串联方式连着的弹药，主要提供给全自动发射机枪或机砲，以达到持续火力的效果。

弹链可分为「可散式弹链」及「不可散式弹链」，材质由帆布到金属各有不同。

弹链的主要目的是令机枪可无间断地持续发射连串子弹，近代的机枪由于射速较高，标准弹匣无法做到持续火力效果，而大容量弹匣亦经常出现卡弹问题，原因是弹匣供弹过快令机匣导气量不足。弹链通常存放在弹链携行箱（又称弹箱）内，可挂于机枪侧面或底部，令装备轻型机枪、中型机枪或通用机枪的士兵作战时可携带大量弹药。

最初的是加特林机枪用称为布质弹带，因为其轻便和较易徒手再填装而普及，一战时马克沁机枪等都继续采用。但缺点是容易引起进退弹不顺故在现代机枪鲜见。

"Shot belt" or "ammunition belt" can also refer to a belt that a person wears, with loops for inserting ammunition cartridges.

A belt or ammunition belt is a device used to retain and feed cartridges into a firearm. Belts and the associated feed systems are typically employed to feed machine guns or other automatic weapons. Belt-fed systems minimize the proportional weight of the ammunition to the feeding device along with allowing high rates of continuous fire.